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c in (-oo:+oo)
13 = (9/5)*c+32 // - (9/5)*c+32
13-((9/5)*c)-32 = 0
(-9/5)*c-32+13 = 0
-9/5*c-19 = 0 // + 19
-9/5*c = 19 // : -9/5
c = 19/(-9/5)
c = -95/9
c = -95/9
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