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D( x )
1.8*x = 0
1.8*x = 0
1.8*x = 0
1.8*x = 0 // : 1.8
x = 0
x in (-oo:0) U (0:+oo)
(x-32)/(1.8*x) = 0
x-32 = 0 // + 32
x = 32
x = 32
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