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7*x+2*x+1/2 = 73/2 // - 73/2
7*x+2*x+1/2-(73/2) = 0
7*x+2*x+1/2-73/2 = 0
9*x-36 = 0 // + 36
9*x = 36 // : 9
x = 36/9
x = 4
x = 4
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