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q in (-oo:+oo)
(2/3)*q-2 = (21/3)*q+7 // - (21/3)*q+7
(2/3)*q-((21/3)*q)-7-2 = 0
(2/3)*q-7*q-7-2 = 0
-19/3*q-9 = 0 // + 9
-19/3*q = 9 // : -19/3
q = 9/(-19/3)
q = -27/19
q = -27/19
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