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D( x )
(x+7)*(x-2) = 0
(x+7)*(x-2) = 0
(x+7)*(x-2) = 0
( x+7 )
x+7 = 0 // - 7
x = -7
( x-2 )
x-2 = 0 // + 2
x = 2
x in (-oo:-7) U (-7:2) U (2:+oo)
(2*x+3)/((x+7)*(x-2)) = 0
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
x = -3/2
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