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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2.3/y = 2.5/7.2 // - 2.5/7.2
2.3/y-(2.5/7.2) = 0
2.3/y-0.34722222 = 0
2.3*y^-1 = 0.34722222 // : 2.3
y^-1 = 0.15096618
-1 < 0
1/(y^1) = 0.15096618 // * y^1
1 = 0.15096618*y^1 // : 0.15096618
6.62400016 = y^1
y = 6.62400016
y = 6.62400016
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