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q in (-oo:+oo)
q-(1/2) = 4-q // - 4-q
q+q-(1/2)-4 = 0
q+q-1/2-4 = 0
2*q-9/2 = 0 // + 9/2
2*q = 9/2 // : 2
q = 9/2/2
q = 9/4
q = 9/4
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