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q in (-oo:+oo)
(2/7)*(14*q-2+7)-(3*q) = 9 // - 9
(2/7)*(14*q-2+7)-(3*q)-9 = 0
(2/7)*(14*q-2+7)-3*q-9 = 0
2/7*(14*q+5)-3*q-9 = 0
2/7*(14*q+5)-3*q-9 = 0
q-9+10/7 = 0
q-53/7 = 0
q-53/7 = 0
q-53/7 = 0 // + 53/7
q = 53/7
q = 53/7
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