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x in (-oo:+oo)
x = (x-32)/1.8 // - (x-32)/1.8
x-((x-32)/1.8) = 0
x-0.55555556*(x-32) = 0
x-0.55555556*(x-32) = 0
0.44444444*x+17.77777792 = 0
0.44444444*x+17.77777792 = 0
0.44444444*x+17.77777792 = 0 // - 17.77777792
0.44444444*x = -17.77777792 // : 0.44444444
x = -17.77777792/0.44444444
x = -40.00000072
x = -40.00000072
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