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(3/4)*x-12 = 15-(1/2) // - 15-(1/2)
(3/4)*x+1/2-15-12 = 0
3/4*x-53/2 = 0 // + 53/2
3/4*x = 53/2 // : 3/4
x = 53/2/3/4
x = 106/3
x = 106/3
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