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13 = (5/9)*(x-32) // - (5/9)*(x-32)
13-((5/9)*(x-32)) = 0
(-5/9)*(x-32)+13 = 0
13-5/9*(x-32) = 0
13-5/9*(x-32) = 0
277/9-5/9*x = 0
277/9-5/9*x = 0
277/9-5/9*x = 0 // - 277/9
-5/9*x = -277/9 // : -5/9
x = -277/9/(-5/9)
x = 277/5
x = 277/5
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