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f in (-oo:+oo)
(5/9)*(f-32) = 7 // - 7
(5/9)*(f-32)-7 = 0
5/9*(f-32)-7 = 0
5/9*(f-32)-7 = 0
5/9*f-223/9 = 0
5/9*f-223/9 = 0
5/9*f-223/9 = 0 // + 223/9
5/9*f = 223/9 // : 5/9
f = 223/9/5/9
f = 223/5
f = 223/5
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