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c in (-oo:+oo)
87 = (9/5)*c+32 // - (9/5)*c+32
87-((9/5)*c)-32 = 0
(-9/5)*c-32+87 = 0
55-9/5*c = 0 // - 55
-9/5*c = -55 // : -9/5
c = -55/(-9/5)
c = 275/9
c = 275/9
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