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q in (-oo:+oo)
(2/3)*q = 4.5 // - 4.5
(2/3)*q-4.5 = 0
2/3*q-4.5 = 0 // + 4.5
2/3*q = 4.5 // : 2/3
q = 4.5/2/3
q = 6.74999997
q = 6.74999997
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