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(1/2)*b+9*x-(2*x) = 0
(1/2)*b+9*x-2*x = 0
1/2*b+7*x = 0 // - 1/2*b
7*x = -(1/2*b) // : 7
x = (-(1/2*b))/7
x = -1/14*b
x = -1/14*b
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