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q in (-oo:+oo)
(12/7)*q-((1/21)*q) = q-(4/3) // - q-(4/3)
(12/7)*q-((1/21)*q)-q+4/3 = 0
(12/7)*q+(-1/21)*q-q+4/3 = 0
2/3*q+4/3 = 0 // - 4/3
2/3*q = -4/3 // : 2/3
q = -4/3/2/3
q = -2
q = -2
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