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D( X )
3*(X+3) = 0
3*(X+3) = 0
3*(X+3) = 0
X+3 = 0 // - 3
X = -3
X in (-oo:-3) U (-3:+oo)
(3*X+7)/3-((4*X+5)/(3*(X+3))) = 0
(3*X+7)/3+(-1*(4*X+5))/(3*(X+3)) = 0
(3*X+7)/3+(-1*(4*X+5))/3 = 0
3*X-1*(4*X+5)+7 = 0
2-X = 0
(2-X)/3 = 0
(2-X)/3 = 0 // * 3
2-X = 0
2-X = 0 // - 2
-X = -2 // * -1
X = 2
X = 2
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