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q in (-oo:+oo)
-(3-q) = (-1/2)*(6*q-26) // - (-1/2)*(6*q-26)
q-((-1/2)*(6*q-26))-3 = 0
(1/2)*(6*q-26)+q-3 = 0
1/2*(6*q-26)+q-3 = 0
1/2*(6*q-26)+q-3 = 0
4*q-13-3 = 0
4*q-16 = 0
4*q-16 = 0
4*q-16 = 0 // + 16
4*q = 16 // : 4
q = 16/4
q = 4
q = 4
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