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Q in (-oo:+oo)
Q = 15-((1/2)*(15-((1/2)*Q))) // - 15-((1/2)*(15-((1/2)*Q)))
(1/2)*(15-((1/2)*Q))+Q-15 = 0
(1/2)*((-1/2)*Q+15)+Q-15 = 0
1/2*(15-1/2*Q)+Q-15 = 0
1/2*(15-1/2*Q)+Q-15 = 0
3/4*Q-15+15/2 = 0
3/4*Q-15/2 = 0
3/4*Q-15/2 = 0
3/4*Q-15/2 = 0 // + 15/2
3/4*Q = 15/2 // : 3/4
Q = 15/2/3/4
Q = 10
Q = 10
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