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Q in (-oo:+oo)
4*(6+8)*((3*Q)/2) = 20 // - 20
4*(6+8)*((3*Q)/2)-20 = 0
84*Q-20 = 0 // + 20
84*Q = 20 // : 84
Q = 20/84
Q = 5/21
Q = 5/21
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