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(3/4)*(x-8) = 15 // - 15
(3/4)*(x-8)-15 = 0
3/4*(x-8)-15 = 0
3/4*(x-8)-15 = 0
3/4*x-21 = 0
3/4*x-21 = 0
3/4*x-21 = 0 // + 21
3/4*x = 21 // : 3/4
x = 21/3/4
x = 28
x = 28
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