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9*x-(2*(1/2)*x)-7 = -18 // + 18
9*x-(2*(1/2)*x)-7+18 = 0
9*x-x-7+18 = 0
8*x+11 = 0 // - 11
8*x = -11 // : 8
x = -11/8
x = -11/8
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