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q in (-oo:+oo)
(q+8)/3+(q-4)/4 = 4 // - 4
(q+8)/3+(q-4)/4-4 = 0
(4*(q+8))/(3*4)+(3*(q-4))/(3*4)+(-4*3*4)/(3*4) = 0
4*(q+8)+3*(q-4)-4*3*4 = 0
7*q-48+20 = 0
7*q-28 = 0
(7*q-28)/(3*4) = 0
(7*q-28)/(3*4) = 0 // * 3*4
7*q-28 = 0
7*q-28 = 0 // + 28
7*q = 28 // : 7
q = 28/7
q = 4
q = 4
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