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I in (-oo:+oo)
I/0.8 = 4.9 // - 4.9
I/0.8-4.9 = 0
1.25*I-4.9 = 0 // + 4.9
1.25*I = 4.9 // : 1.25
I = 4.9/1.25
I = 3.92
I = 3.92
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