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(3/5)*x = 15/2 // - 15/2
(3/5)*x-(15/2) = 0
(3/5)*x-15/2 = 0
3/5*x-15/2 = 0 // + 15/2
3/5*x = 15/2 // : 3/5
x = 15/2/3/5
x = 25/2
x = 25/2
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