簡易方程式(20點)

六分之一(2y十6)=八分之一(10-2y)
y = ?

1/6 (2y + 6) = 1/8 (10 – 2y)
(1/6) (2y) + (1/6) (6) = (1/8) (10) – (1/8)(2y)
(1/3)y + 1 = 10/8 - (2/8)y
(1/3)y + 1 = 5/4 - (1/4)y
(1/3)y + (1/4)y = 5/4 - 1
(4/12)y + (3/12)y = 1/4
(7/12) y = ¼
y = (¼)/(7/12)
y = (¼)/(12/7)

y = 3/7

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8z-3
____ =20%X(3z+2)
6

z = ?

8z-3
____ =20/100 X(3z+2)
6

8z-3
____ =0.2 X(3z+2)
6

8z – 3 = 0.2 X 6 (3z + 2)
8z – 3 = 1.2 (3z + 2)
8z – 3 = (1.2) (3z) + 2(1.2)
8z – 3 = 3.6z + 2.4
8z – 3.6z = + 2.4 + 3
4.4 z = 5.4
z = 54/44

z = 27/22