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Q in (-oo:+oo)
Q/2 = 15/8 // - 15/8
Q/2-(15/8) = 0
Q/2-15/8 = 0
1/2*Q-15/8 = 0 // + 15/8
1/2*Q = 15/8 // : 1/2
Q = 15/8/1/2
Q = 15/4
Q = 15/4
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