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q in (-oo:+oo)
q/3 = -7.4 // + 7.4
q/3+7.4 = 0
1/3*q+7.4 = 0 // - 7.4
1/3*q = -7.4 // : 1/3
q = -7.4/1/3
q = -22.20000022
q = -22.20000022
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