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q in (-oo:+oo)
7-(2*q) = (-1/3)*(3-3*q) // - (-1/3)*(3-3*q)
7-((-1/3)*(3-3*q))-(2*q) = 0
(1/3)*(3-3*q)-2*q+7 = 0
1/3*(3-3*q)-2*q+7 = 0
1/3*(3-3*q)-2*q+7 = 0
1-3*q+7 = 0
8-3*q = 0
8-3*q = 0
8-3*q = 0 // - 8
-3*q = -8 // : -3
q = -8/(-3)
q = 8/3
q = 8/3
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