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-167/2 = (-1/2)*x-(7*x)-1 // - (-1/2)*x-(7*x)-1
7*x-((-1/2)*x)-167/2+1 = 0
(1/2)*x+7*x-167/2+1 = 0
15/2*x-165/2 = 0 // + 165/2
15/2*x = 165/2 // : 15/2
x = 165/2/15/2
x = 11
x = 11
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