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c in (-oo:+oo)
100 = (9*c)/5+32 // - (9*c)/5+32
100-((9*c)/5)-32 = 0
(-9/5)*c-32+100 = 0
68-9/5*c = 0 // - 68
-9/5*c = -68 // : -9/5
c = -68/(-9/5)
c = 340/9
c = 340/9
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