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q in (-oo:+oo)
(2/5)*q = 4/7 // - 4/7
(2/5)*q-(4/7) = 0
(2/5)*q-4/7 = 0
2/5*q-4/7 = 0 // + 4/7
2/5*q = 4/7 // : 2/5
q = 4/7/2/5
q = 10/7
q = 10/7
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