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q in (-oo:+oo)
(-5/6)*q-q+1 = (1/4)*(80-q) // - (1/4)*(80-q)
(-5/6)*q-((1/4)*(80-q))-q+1 = 0
(-1/4)*(80-q)+(-5/6)*q-q+1 = 0
(-5*q)/6-1/4*(80-q)-q+1 = 0
(-1/4*6*(80-q))/6+(-5*q)/6+(6*(-q))/6+(1*6)/6 = 0
6*(-q)-1/4*6*(80-q)-5*q+1*6 = 0
6-7/2*q-6*q-120 = 0
6-19/2*q-120 = 0
-19/2*q-114 = 0
(-19/2*q-114)/6 = 0
(-19/2*q-114)/6 = 0 // * 6
-19/2*q-114 = 0
-19/2*q-114 = 0 // + 114
-19/2*q = 114 // : -19/2
q = 114/(-19/2)
q = -12
q = -12
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