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q in (-oo:+oo)
280 = (5/2)*q // - (5/2)*q
280-((5/2)*q) = 0
(-5/2)*q+280 = 0
280-5/2*q = 0 // - 280
-5/2*q = -280 // : -5/2
q = -280/(-5/2)
q = 112
q = 112
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