(7/5)×(X+12)=5x-12我急用。

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(7/5)×(X+12)=5x-12我急用。
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(7/5)×(X+12)=5x-12我急用。
(7/5)×(X+12)=5x-12
我急用。

(7/5)×(X+12)=5x-12我急用。
(7/5)×(X+12)=5x-12
1.4x+16.8=5x-12
1.4x+16.8+12=5x-12+12
5x=1.4x+28.8
5x-1.4x=28.8
(5-1.4)x=28.8
3.6x=28.8
x=28.8/3.6
x=8