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f in (-oo:+oo)
7*f = 37/7 // - 37/7
7*f-(37/7) = 0
7*f-37/7 = 0
7*f-37/7 = 0 // + 37/7
7*f = 37/7 // : 7
f = 37/7/7
f = 37/49
f = 37/49
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