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17. 等式两边同乘以12得:
3x + 2x + x =12
6x =12
x = 2
18. 2(x-1) =5 -3(x+4)
2x - 2 = 5- 3x -12
2x + 3x = 5-12+2
5x = -5
x=-1
19. 等式两边同乘以12得:
3(3y - 1) - 2(5y-7) =12
9y - 3 - 10y +14 =12
-y = 12+3-14
-y = 1
y =-1
3x + 2x + x =12
6x =12
x = 2
18. 2(x-1) =5 -3(x+4)
2x - 2 = 5- 3x -12
2x + 3x = 5-12+2
5x = -5
x=-1
19. 等式两边同乘以12得:
3(3y - 1) - 2(5y-7) =12
9y - 3 - 10y +14 =12
-y = 12+3-14
-y = 1
y =-1
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