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c in (-oo:+oo)
19 = (9/5)*c+32 // - (9/5)*c+32
19-((9/5)*c)-32 = 0
(-9/5)*c-32+19 = 0
-9/5*c-13 = 0 // + 13
-9/5*c = 13 // : -9/5
c = 13/(-9/5)
c = -65/9
c = -65/9
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