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(3/7)*(x-8) = 3 // - 3
(3/7)*(x-8)-3 = 0
3/7*(x-8)-3 = 0
3/7*(x-8)-3 = 0
3/7*x-45/7 = 0
3/7*x-45/7 = 0
3/7*x-45/7 = 0 // + 45/7
3/7*x = 45/7 // : 3/7
x = 45/7/3/7
x = 15
x = 15
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