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(3/2)*x-(9/2) = 15/2 // - 15/2
(3/2)*x-(9/2)-(15/2) = 0
(3/2)*x-9/2-15/2 = 0
3/2*x-12 = 0 // + 12
3/2*x = 12 // : 3/2
x = 12/3/2
x = 8
x = 8
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