12×0.8-2x=4.还有2x-1.5x=7.5 32-7x-5x=20

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12×0.8-2x=4.还有2x-1.5x=7.532-7x-5x=2012×0.8-2x=4.还有2x-1.5x=7.532-7x-5x=2012×0.8-2x=4.还有2x-1.5x=7.532-

12×0.8-2x=4.还有2x-1.5x=7.5 32-7x-5x=20
12×0.8-2x=4.
还有2x-1.5x=7.5 32-7x-5x=20

12×0.8-2x=4.还有2x-1.5x=7.5 32-7x-5x=20
12×0.8-2x=4.9
9.6-2x=4.9
-2x=4.9-9.6
2x=9.6-4.9
2x=4.7
x=2.35
2x-1.5x=7.5
(2-1.5)x=7.5
0.5x=7.5
x=15
32-7x-5x=20
32-(7+5)x=20
32-12x=20
-12x=20-32
12x=12
x=1
够详细了吧?