0.8X-(X-7)=3

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0.8X-(X-7)=30.8X-(X-7)=30.8X-(X-7)=30.8X-(X-7)=30.8X-X+7=30.8X-X=3-70.2X=4X=4/0.2X=200.8X-(X-7)=30.8

0.8X-(X-7)=3
0.8X-(X-7)=3

0.8X-(X-7)=3
0.8X-(X-7)=3
0.8X-X+7=3
0.8X-X=3-7
0.2X=4
X=4/0.2
X=20

0.8X-(X-7)=3
0.8X-X+7=3
0.8X-X=3-7
0.2X=4
X=4/0.2
X=20

X=20

0.2x+7=3
0.2x=-4
x=-20

答案是:x=20。式子可化为:0.2x=7-3=4。到这里相信你应该会做了。

X=20

20

0.8x-x+7=3
_0.2x=_4
x=20

0.8X-X+7=3
-0.2X=3-7=-4
0.2x=4
x=4/0.2=40/2=20