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