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12*x-(5*x)+3/2 = 11/2 // - 11/2
12*x-(5*x)+3/2-(11/2) = 0
12*x-5*x+3/2-11/2 = 0
7*x-4 = 0 // + 4
7*x = 4 // : 7
x = 4/7
x = 4/7
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