數學!help!! very 急!!

1) 19-7b-5b=-53
-7b-5b=-72
-12b=-72
b=6

2) 3(2-z)= -9
6-3z= -9
-3z= -15
z=5

3) 16= -8(5p+8)
16= -40p-64
80= -40p
-2= p
p= -2

4) 5(7+3q)+12= 2
5(7+3q)= -10
35+15q= -10
15q= -45
q= -3

好野,終於計好啦

1) 19-7b-5b=-53
-12b=-53-19
-12b=-72
-b=-6
b=6
--------------------------------------------------------------------------------------------------------------------------------
2) 3(2-z)=-9
6-3z=-9
-3z=-9-6
-3z=-15
-z=-5
z=5
-------------------------------
3) 16=-8(5p+8)
16/-8=5p+8
-2=5p+8
-2-8=5p
-10=5p
-2=p
p=-2
------------------------------------
4) 5(7+3q)+12=2
5(7+3q)=2-12
7-3q=-10/5
7-3q=-2
-3q=-2-7
-3q=-9
q=3
---------------------------------------

1) 19-7b-5b=-53
-12b=-53-19
-12b=-72
-b=-6
b=6
2) 3(2-z)=-9
6-3z=-9
-3z=-9-6
-3z=-15
-z=-5
z=5
3) 16=-8(5p+8)
16/-8=5p+8
-2=5p+8
-2-8=5p
-10=5p
-2=p
p=-2
4) 5(7+3q)+12=2
5(7+3q)=2-12
7-3q=-10/5
7-3q=-2
-3q=-2-7
-3q=-9
q=3

19 - 7b - 5b = -53
19 - 12b = -53
19 + 53 = 12b
72 = 12b
b = 6

3 ( 2 - z ) = -9
6 - 3z = -9
6 + 9 = 3z
15 = 3z
z = 5

16 = -8 ( 5p + 8 )
16 = -40p + ( -64 )
16 = -40p - 64
80 = -40p
-2 = p

5 ( 7 + 3q ) + 12 = 2
35 + 15q + 12 = 2
47 + 15q = 2
15q = -45
q = -3

19-7b-5b=-53
19-12b=-53
19+53=12b
72=12b
b=6

-------------------------------------------------

3(2-z)=-9
6-3z=-9
6+9=3z
15=3z
z=5

------------------------------------------------

16=-8(5p+8)
16=-40p-64
40p=-64-16
40p=-80
p=-2

-------------------------------------------------

5(7+3q)+12=2
35+15q+12=2
15q+47=2
15q=2-47
15q=-45
q=-3