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q in (-oo:+oo)
-((5/2)*q)-9 = (-1/4)*(4-6*q) // - (-1/4)*(4-6*q)
-((-1/4)*(4-6*q))-((5/2)*q)-9 = 0
(1/4)*(4-6*q)+(-5/2)*q-9 = 0
1/4*(4-6*q)+(-5*q)/2-9 = 0
(1/4*2*(4-6*q))/2+(-5*q)/2+(-9*2)/2 = 0
1/4*2*(4-6*q)-5*q-9*2 = 0
2-8*q-18 = 0
-8*q-16 = 0
(-8*q-16)/2 = 0
(-8*q-16)/2 = 0 // * 2
-8*q-16 = 0
-8*q-16 = 0 // + 16
-8*q = 16 // : -8
q = 16/(-8)
q = -2
q = -2
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