3 4 1

Question

- + --- = - -
x x+2 x

Answer 1

sorry it posted stupid, its:

3/x + 4/x+2 = -1/x

Answer 2

3/x + 4/(x+2) = -1/x
multiply each term by x(x+2)

3(x+2) + 4x = -1(x+2)
expand and re-arrange, after that it is easy.

Answer 3

thank you