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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
3/(x+4)-7 = -4/(x+4) // + -4/(x+4)
3/(x+4)-(-4/(x+4))-7 = 0
3/(x+4)+4*(x+4)^-1-7 = 0
3/(x+4)+4/(x+4)-7 = 0
3/(x+4)+4/(x+4)+(-7*(x+4))/(x+4) = 0
3-7*(x+4)+4 = 0
7-7*x-28 = 0
-7*x-21 = 0
(-7*x-21)/(x+4) = 0
(-7*x-21)/(x+4) = 0 // * x+4
-7*x-21 = 0
-7*x-21 = 0 // + 21
-7*x = 21 // : -7
x = 21/(-7)
x = -3
x = -3
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