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q in (-oo:+oo)
4*(1-(q/2))-3*q = 8-(13*q) // - 8-(13*q)
4*(1-(q/2))-3*q+13*q-8 = 0
4*(1-1/2*q)-3*q+13*q-8 = 0
4*(1-1/2*q)-3*q+13*q-8 = 0
13*q-5*q-8+4 = 0
8*q-8+4 = 0
8*q-4 = 0
8*q-4 = 0
8*q-4 = 0 // + 4
8*q = 4 // : 8
q = 4/8
q = 1/2
q = 1/2
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