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q in (-oo:+oo)
(5*(q-7))/12 = 2/3 // - 2/3
(5*(q-7))/12-(2/3) = 0
(5*(q-7))/12-2/3 = 0
(3*5*(q-7))/(3*12)+(-2*12)/(3*12) = 0
3*5*(q-7)-2*12 = 0
15*q-129 = 0
(15*q-129)/(3*12) = 0
(15*q-129)/(3*12) = 0 // * 3*12
15*q-129 = 0
15*q-129 = 0 // + 129
15*q = 129 // : 15
q = 129/15
q = 43/5
q = 43/5
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