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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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