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q in (-oo:+oo)
q/(-9.5) = 2.1 // - 2.1
q/(-9.5)-2.1 = 0
-0.10526316*q-2.1 = 0 // + 2.1
-0.10526316*q = 2.1 // : -0.10526316
q = 2.1/(-0.10526316)
q = -19.9499996
q = -19.9499996
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