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f in (-oo:+oo)
(5/9)*(f-42) = 25 // - 25
(5/9)*(f-42)-25 = 0
5/9*(f-42)-25 = 0
5/9*(f-42)-25 = 0
5/9*f-145/3 = 0
5/9*f-145/3 = 0
5/9*f-145/3 = 0 // + 145/3
5/9*f = 145/3 // : 5/9
f = 145/3/5/9
f = 87
f = 87
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