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x in (-oo:+oo)
25 = (5/9)*(x-32) // - (5/9)*(x-32)
25-((5/9)*(x-32)) = 0
(-5/9)*(x-32)+25 = 0
25-5/9*(x-32) = 0
25-5/9*(x-32) = 0
385/9-5/9*x = 0
385/9-5/9*x = 0
385/9-5/9*x = 0 // - 385/9
-5/9*x = -385/9 // : -5/9
x = -385/9/(-5/9)
x = 77
x = 77
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