Why I get a syntax error on desolve

[Anthony The Koala]

Dear roadrunner,
Thank you.

Entering into the home screen:

CAS(EVAL("desolve(4*y''-6*y'+7*y=0,x,y)"))

Did work!

And thank you about entering the following in CAS mode.

desolve(4*y''-6*y'+7*y=0,x,y)

Again to enter the above command must be in CAS mode.

Thank you
Anthony, Sydney