Question: Isolating Expressions

Hi there,

I'm doing my first steps with Maple and am a little confused with a problem:
I want to solve something like

and expect the result to be z=-m*a. However I get empty brackets as result.
I tried to dig a little and I find that maple has problems isolating x1+x2+x3+x4


Error, (in isolate) x1*a+x2*a+x3*a+x4*a does not contain x1+x2+x3+x4


 

When I isolate it myself Maple even tells me they wouldn't be the same


false

I even reduced the problem to x1*a+x2*a and Maple still has problems with that. As this is a really simple problem I strongly assume the issue lies with the user. Can anyone help me there?

Thanks

 

 

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