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q in (-oo:+oo)
(8*q)/5 = 7/9 // - 7/9
(8*q)/5-(7/9) = 0
(8*q)/5-7/9 = 0
8/5*q-7/9 = 0 // + 7/9
8/5*q = 7/9 // : 8/5
q = 7/9/8/5
q = 35/72
q = 35/72
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