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(1/2)*x+2*x+7 = 29/2 // - 29/2
(1/2)*x+2*x-(29/2)+7 = 0
(1/2)*x+2*x-29/2+7 = 0
5/2*x-15/2 = 0 // + 15/2
5/2*x = 15/2 // : 5/2
x = 15/2/5/2
x = 3
x = 3
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