Question: How to point on specific summand in expression?

Hello,

 

Is it possible in Maple to select summand with some command?

For example:

eq := a+b = 0;
                           a + b = 0
eq-b;
                             a = -b

How to generalize second line?(in this case I explicitly told to subtract b, but I want to pick b by some command)

And I am not talking about solving, isolation or anything like that in this case. I just want to transfer something from lhs to rhs by selecting it beforehand.

 

 

Thank you.

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