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