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q in (-oo:+oo)
260 = 490-((5/7)*q) // - 490-((5/7)*q)
(5/7)*q-490+260 = 0
5/7*q-230 = 0 // + 230
5/7*q = 230 // : 5/7
q = 230/5/7
q = 322
q = 322
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