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q in (-oo:+oo)
(2/5)*(2-q) = (1/5)*(q+7) // - (1/5)*(q+7)
(2/5)*(2-q)-((1/5)*(q+7)) = 0
(2/5)*(2-q)+(-1/5)*(q+7) = 0
2/5*(2-q)-1/5*(q+7) = 0
2/5*(2-q)-1/5*(q+7) = 0
-3/5*q-3/5 = 0
-3/5*q-3/5 = 0
-3/5*q-3/5 = 0 // + 3/5
-3/5*q = 3/5 // : -3/5
q = 3/5/(-3/5)
q = -1
q = -1
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