2b+a=2a-b…….equation 1

Question

a+5=2a-b…….equation 2

Answer 1

I assume you are solving.

#1
2b+a=2a-b
3b = a

#2
a+5=2a-b
5+b = a

so since they are both equal to a,
3b = 5+b
2b = 5
b = 5/2
then a = 3b
a = 3(5/2) = 15/2