math!!!!!! quick!!!!!!!!!!!!!!

1.a-5=c-2

=a-c=3

(4.)=c+3=a
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2.b*6=24

=24/6=b

so,b=4
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3.c*a=18

(5.)=18/a=c
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put5. into4.
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just:
=18/a=a-3

=a*(a-3)=18
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and than put(a-3) to right side
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just:
=18/(a-3)=a
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beacause
a>3,so
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=18/a=a-3
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put (a)to right side
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just:
=18=(a-3)*a

=a*a-a*3=18
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put(a*3) to right side
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just:
=a*a=18+a*3

=a*a=(6+a)*3
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put(*a) to left side
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just:
=a*a*a=6*3*2*a

=6*6*a=a*a*a
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two side" a" delete
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chaege to:
=6*6=a*a

=36=a*a

so,

a=6

c=3

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my 解答 is:
a=6
b=4

a-5 = c-2 ... 1

6b = 24 ... 2

ac = 18 ... 3

in (2),
6b = 24
6b/6 = 24/6
b = 4

in (1),
a-5 = c-2
a-3 = c
c = a-3 ... (4)

sub. (4) into (3),
ac = 18
a(a-3) = 18
a² - 3a - 18 = 0
(a+3)(a-6) = 0 ... by using cross-method
a+3 = 0
or
a-6 = 0

a = -3 or 6

a-5 = c-2 ... (1)
b*6 = 24 ... (2)
c*a = 18 ... (3)

From (3),
c= 18 / a ...... (4)

Sub (4) into (1),
a-5 = 18/a - 2
a-5+2 = 18/a
a-3 = 18/a
a^2 - 3a = 18
a^2 -3a - 18 = 0
(a-6) (a+3) = 0
a = 6 OR a = -3

From (2),
b=24/6
b=4

a=6
b=4
[maybe 錯]

a=1.c+3

3.18
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c


b=2.b=4

c=1.a-3
3.18
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a