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Q in (-oo:+oo)
Q/4.2 = Q-1.7 // - Q-1.7
Q/4.2-Q+1.7 = 0
1.7-0.76190476*Q = 0 // - 1.7
-0.76190476*Q = -1.7 // : -0.76190476
Q = -1.7/(-0.76190476)
Q = 2.23125001
Q = 2.23125001
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