Question: need a help on simplify

hi all, sorry, i'm a newbie on maple

i have to simplify some equation, then i heard that it can be done by maple. so i tried using maple 10 to simplify my equation.

but after i write down the equation, and press enter, i got "unable to match delimiters" message. what should i do to get the simplified equation?

here is the equation:

(((((X1  * (((X3  / X1 ) + (X2  * ((((((X1  * (((X1  / X1 ) + (X4  + X1 )) / (X4  / ((X2  / X3 ) / -0.570992561856773)))) - (X1  - -0.5457363063736358)) * X2 ) + X1 ) + X3 ) / X2 ))) / (X4  / ((X4  + X2 ) / -0.570992561856773)))) - (X1  - -0.5457363063736358)) * X2 ) + X1 ) * (((0.2061949348454455 * ((-0.6832734709973418 + X3 ) / -0.570992561856773)) - X1 ) / (X4  - 0.2061949348454455)))

is it possible to simplify this equation using mapple? i really need a help on this

thanks, sanny.