# Are you good at manipulating?

Algebra Level 2

$x=\dfrac {a-b}{a+b} \quad,\quad y=\dfrac {b-c}{b+c}\quad,\quad z=\dfrac {c-a}{c+a}.$

If $$x,y$$ and $$z$$ satisfy the equations above, then express $\dfrac {(1+x)(1+y)(1+z)}{(1-x)(1-y)(1-z)}$

in terms of $$a,b$$ and $$c$$.

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