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q in (-oo:+oo)
3500 = 90-(q/100) // - 90-(q/100)
q/100-90+3500 = 0
1/100*q+3410 = 0 // - 3410
1/100*q = -3410 // : 1/100
q = -3410/1/100
q = -341000
q = -341000
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