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q in (-oo:+oo)
14 = 5-((2/7)*q) // - 5-((2/7)*q)
(2/7)*q-5+14 = 0
2/7*q+9 = 0 // - 9
2/7*q = -9 // : 2/7
q = -9/2/7
q = -63/2
q = -63/2
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