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q in (-oo:+oo)
2*((1/2)*q+1)-(3*(2*q-1))+4*(2*q+1) = 0
2*((1/2)*q+1)-3*(2*q-1)+4*(2*q+1) = 0
2*(1/2*q+1)-3*(2*q-1)+4*(2*q+1) = 0
2*(1/2*q+1)-3*(2*q-1)+4*(2*q+1) = 0
8*q-5*q+4+5 = 0
3*q+9 = 0
3*q+9 = 0
3*q+9 = 0 // - 9
3*q = -9 // : 3
q = -9/3
q = -3
q = -3
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