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f in (-oo:+oo)
-17 = -((3/5)*f)-32 // + -((3/5)*f)-32
(3/5)*f-17+32 = 0
3/5*f+15 = 0 // - 15
3/5*f = -15 // : 3/5
f = -15/3/5
f = -25
f = -25
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