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q in (-oo:+oo)
-2 = q/(-0.3) // - q/(-0.3)
-(q/(-0.3))-2 = 0
3.33333333*q-2 = 0
3.33333333*q-2 = 0 // + 2
3.33333333*q = 2 // : 3.33333333
q = 2/3.33333333
q = 0.6
q = 0.6
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