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Q in (-oo:+oo)
100-(4*Q) = Q/2 // - Q/2
100-(4*Q)-(Q/2) = 0
100-4*Q-(Q/2) = 0
100-9/2*Q = 0 // - 100
-9/2*Q = -100 // : -9/2
Q = -100/(-9/2)
Q = 200/9
Q = 200/9
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