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x in (-oo:+oo)
-20 = (5/9)*(x-32) // - (5/9)*(x-32)
-((5/9)*(x-32))-20 = 0
(-5/9)*(x-32)-20 = 0
-5/9*(x-32)-20 = 0
-5/9*(x-32)-20 = 0
-5/9*x-20/9 = 0
-5/9*x-20/9 = 0
-5/9*x-20/9 = 0 // + 20/9
-5/9*x = 20/9 // : -5/9
x = 20/9/(-5/9)
x = -4
x = -4
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