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f in (-oo:+oo)
35 = (5/7)*f // - (5/7)*f
35-((5/7)*f) = 0
(-5/7)*f+35 = 0
35-5/7*f = 0 // - 35
-5/7*f = -35 // : -5/7
f = -35/(-5/7)
f = 49
f = 49
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