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(1/5)*(x-15) = 7 // - 7
(1/5)*(x-15)-7 = 0
1/5*(x-15)-7 = 0
1/5*(x-15)-7 = 0
1/5*x-10 = 0
1/5*x-10 = 0
1/5*x-10 = 0 // + 10
1/5*x = 10 // : 1/5
x = 10/1/5
x = 50
x = 50
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