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(a+b)+(a-b)
a+b+a-b
a+a
2a
2
(a+b)+(b-a)
a+b+b-a
b+b
2b
3
(a-b)+(a+b)
a-b+a+b
a+a
2a
4
2a-(2a-3b)-b
2a-2a+3b-b
3b+b
4b
5
3x+2y-[x-(x-y)]
3x+2y-[x-x+y]
3x+2y-y
3x+y
6
2m-3n-(-2m+n-(m-n))
2m-3n-(-2m+n-m+n)
2m-3n-(-3m+2n)
2m-3n+3m-2n
5m-5n
saludos