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f in (-oo:+oo)
-((3/5)*f)-32 = 15 // - 15
-((3/5)*f)-32-15 = 0
(-3/5)*f-32-15 = 0
-3/5*f-47 = 0 // + 47
-3/5*f = 47 // : -3/5
f = 47/(-3/5)
f = -235/3
f = -235/3
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