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f in (-oo:+oo)
(5/9)*(f-32) = 30 // - 30
(5/9)*(f-32)-30 = 0
5/9*(f-32)-30 = 0
5/9*(f-32)-30 = 0
5/9*f-430/9 = 0
5/9*f-430/9 = 0
5/9*f-430/9 = 0 // + 430/9
5/9*f = 430/9 // : 5/9
f = 430/9/5/9
f = 86
f = 86
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