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Q in (-oo:+oo)
2*Q = 2500-(Q/2) // - 2500-(Q/2)
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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