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7*x-1/2 = 111/2 // - 111/2
7*x-1/2-(111/2) = 0
7*x-1/2-111/2 = 0
7*x-56 = 0 // + 56
7*x = 56 // : 7
x = 56/7
x = 8
x = 8
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