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7*x+1/2 = 99/2 // - 99/2
7*x+1/2-(99/2) = 0
7*x+1/2-99/2 = 0
7*x-49 = 0 // + 49
7*x = 49 // : 7
x = 49/7
x = 7
x = 7
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