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q in (-oo:+oo)
2*q+q/2 = 2500 // - 2500
2*q+q/2-2500 = 0
5/2*q-2500 = 0 // + 2500
5/2*q = 2500 // : 5/2
q = 2500/5/2
q = 1000
q = 1000
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