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q in (-oo:+oo)
(1/2)*q+(1/7)*q+2/7-(8/7) = 12/7 // - 12/7
(1/2)*q+(1/7)*q+2/7-(8/7)-(12/7) = 0
(1/2)*q+(1/7)*q+2/7-8/7-12/7 = 0
9/14*q-18/7 = 0 // + 18/7
9/14*q = 18/7 // : 9/14
q = 18/7/9/14
q = 4
q = 4
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