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9*x-(15/4) = 2*x+3 // - 2*x+3
9*x-(2*x)-(15/4)-3 = 0
9*x-2*x-15/4-3 = 0
7*x-27/4 = 0 // + 27/4
7*x = 27/4 // : 7
x = 27/4/7
x = 27/28
x = 27/28
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