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q in (-oo:+oo)
(1/3)*(12*q+18) = 6*(2*q-7) // - 6*(2*q-7)
(1/3)*(12*q+18)-(6*(2*q-7)) = 0
(1/3)*(12*q+18)-6*(2*q-7) = 0
1/3*(12*q+18)-6*(2*q-7) = 0
1/3*(12*q+18)-6*(2*q-7) = 0
48-8*q = 0
48-8*q = 0
48-8*q = 0 // - 48
-8*q = -48 // : -8
q = -48/(-8)
q = 6
q = 6
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