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q in (-oo:+oo)
(-2/3)*q+2*q = (6/5)*q+12/5 // - (6/5)*q+12/5
(-2/3)*q+2*q-((6/5)*q)-(12/5) = 0
(-2/3)*q+2*q+(-6/5)*q-12/5 = 0
2/15*q-12/5 = 0 // + 12/5
2/15*q = 12/5 // : 2/15
q = 12/5/2/15
q = 18
q = 18
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