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I in (-oo:+oo)
I/15+3/5 = 4/5 // - 4/5
I/15+3/5-(4/5) = 0
I/15+3/5-4/5 = 0
1/15*I-1/5 = 0 // + 1/5
1/15*I = 1/5 // : 1/15
I = 1/5/1/15
I = 3
I = 3
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