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(1/5)*(x-15)-42 = 0
1/5*(x-15)-42 = 0
1/5*(x-15)-42 = 0
1/5*x-45 = 0
1/5*x-45 = 0
1/5*x-45 = 0 // + 45
1/5*x = 45 // : 1/5
x = 45/1/5
x = 225
x = 225
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