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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.6/x = 5.1/4 // - 5.1/4
3.6/x-(5.1/4) = 0
3.6/x-1.275 = 0
3.6*x^-1 = 1.275 // : 3.6
x^-1 = 0.35416667
-1 < 0
1/(x^1) = 0.35416667 // * x^1
1 = 0.35416667*x^1 // : 0.35416667
2.82352939 = x^1
x = 2.82352939
x = 2.82352939
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