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f in (-oo:+oo)
55 = (3/9)*(f-32) // - (3/9)*(f-32)
55-((3/9)*(f-32)) = 0
(-1/3)*(f-32)+55 = 0
55-1/3*(f-32) = 0
55-1/3*(f-32) = 0
197/3-1/3*f = 0
197/3-1/3*f = 0
197/3-1/3*f = 0 // - 197/3
-1/3*f = -197/3 // : -1/3
f = -197/3/(-1/3)
f = 197
f = 197
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