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q in (-oo:+oo)
203 = (7/2)*q // - (7/2)*q
203-((7/2)*q) = 0
(-7/2)*q+203 = 0
203-7/2*q = 0 // - 203
-7/2*q = -203 // : -7/2
q = -203/(-7/2)
q = 58
q = 58
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