Expression B: (5x + 3y) - (2x - 7y) Expression A: (5x + 3y) + (2x - 7y)
we have that
To simplify Expression A
Combine like terms
5x+2x+3y-7y
7x-4y
To simplify Expression B
Remove the parenthesis second term first
5x+3y-2x+7y
Combine like terms
5x-2x+3y+7y
3x+10y