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q in (-oo:+oo)
1/2 = (-3/7)*q // - (-3/7)*q
1/2-((-3/7)*q) = 0
(3/7)*q+1/2 = 0
3/7*q+1/2 = 0 // - 1/2
3/7*q = -1/2 // : 3/7
q = -1/2/3/7
q = -7/6
q = -7/6
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