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q in (-oo:+oo)
2*(q-(2*q)) = (1/2)*(4-(8*q)) // - (1/2)*(4-(8*q))
2*(q-(2*q))-((1/2)*(4-(8*q))) = 0
2*(q-2*q)+(-1/2)*(4-8*q) = 0
2*(-q)-1/2*(4-8*q) = 0
2*(-q)-1/2*(4-8*q) = 0
2*q-2 = 0
2*q-2 = 0
2*q-2 = 0 // + 2
2*q = 2 // : 2
q = 2/2
q = 1
q = 1
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