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q in (-oo:+oo)
q/3-1.2 = 0.4 // - 0.4
q/3-1.2-0.4 = 0
1/3*q-1.6 = 0 // + 1.6
1/3*q = 1.6 // : 1/3
q = 1.6/1/3
q = 4.80000005
q = 4.80000005
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