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q in (-oo:+oo)
-20 = q/3.2 // - q/3.2
-(q/3.2)-20 = 0
-0.3125*q-20 = 0
-0.3125*q-20 = 0 // + 20
-0.3125*q = 20 // : -0.3125
q = 20/(-0.3125)
q = -64
q = -64
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