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Q in (-oo:+oo)
Q/5.2 = 3.1 // - 3.1
Q/5.2-3.1 = 0
0.19230769*Q-3.1 = 0 // + 3.1
0.19230769*Q = 3.1 // : 0.19230769
Q = 3.1/0.19230769
Q = 16.12000019
Q = 16.12000019
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