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(1/5)*(3*x-15)-12 = 0
1/5*(3*x-15)-12 = 0
1/5*(3*x-15)-12 = 0
3/5*x-15 = 0
3/5*x-15 = 0
3/5*x-15 = 0 // + 15
3/5*x = 15 // : 3/5
x = 15/3/5
x = 25
x = 25
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