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q in (-oo:+oo)
(3/4)*q = 4/7 // - 4/7
(3/4)*q-(4/7) = 0
(3/4)*q-4/7 = 0
3/4*q-4/7 = 0 // + 4/7
3/4*q = 4/7 // : 3/4
q = 4/7/3/4
q = 16/21
q = 16/21
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