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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
412/x = 315 // - 315
412/x-315 = 0
412*x^-1 = 315 // : 412
x^-1 = 315/412
-1 < 0
1/(x^1) = 315/412 // * x^1
1 = 315/412*x^1 // : 315/412
412/315 = x^1
x = 412/315
x = 412/315
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