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Q in (-oo:+oo)
Q/556 = 2/4 // - 2/4
Q/556-(2/4) = 0
Q/556-1/2 = 0
1/556*Q-1/2 = 0 // + 1/2
1/556*Q = 1/2 // : 1/556
Q = 1/2/1/556
Q = 278
Q = 278
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