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q in (-oo:+oo)
(2/7)*q = 2/5 // - 2/5
(2/7)*q-(2/5) = 0
(2/7)*q-2/5 = 0
2/7*q-2/5 = 0 // + 2/5
2/7*q = 2/5 // : 2/7
q = 2/5/2/7
q = 7/5
q = 7/5
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