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q in (-oo:+oo)
(7/16)*q+5/8 = (1/4)*q+3/4 // - (1/4)*q+3/4
(7/16)*q-((1/4)*q)+5/8-(3/4) = 0
(7/16)*q+(-1/4)*q+5/8-3/4 = 0
3/16*q-1/8 = 0 // + 1/8
3/16*q = 1/8 // : 3/16
q = 1/8/3/16
q = 2/3
q = 2/3
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