(X+12)*五分之四=42-X,

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(X+12)*五分之四=42-X,
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(X+12)*五分之四=42-X,
(X+12)*五分之四=42-X,

(X+12)*五分之四=42-X,
(X+12)*(4/5)=42-X
(4/5)X +28/5 =42-X
(4/5 + 1)X=42-(48/5)
X=18

4/5x+48/5=42-x
9/5x=162\5
x=18

(X+12)*4/5=42-X,则(X+12)*4=(42-x)*5,则4X+48=210-5X,则X=18