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q in (-oo:+oo)
18 = (-2/3)*q-6 // - (-2/3)*q-6
6-((-2/3)*q)+18 = 0
(2/3)*q+6+18 = 0
2/3*q+24 = 0 // - 24
2/3*q = -24 // : 2/3
q = -24/2/3
q = -36
q = -36
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