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Q in (-oo:+oo)
2/3 = -Q/4 // + -Q/4
2/3-(-Q/4) = 0
(1/4)*Q+2/3 = 0
1/4*Q+2/3 = 0 // - 2/3
1/4*Q = -2/3 // : 1/4
Q = -2/3/1/4
Q = -8/3
Q = -8/3
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