(x+15)乘以五分之三=x乘以五分之四

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(x+15)乘以五分之三=x乘以五分之四(x+15)乘以五分之三=x乘以五分之四(x+15)乘以五分之三=x乘以五分之四(x+15)*3=4x3x+45=4x移项得x=454560*0.6=45*0.

(x+15)乘以五分之三=x乘以五分之四
(x+15)乘以五分之三=x乘以五分之四

(x+15)乘以五分之三=x乘以五分之四
(x+15)*3=4x 3x+45=4x 移项得x=45

45 60*0.6=45*0.8

(x+15)x3/5=4/5x
3/5x+9=4/5x
x=45

45