Combine like terms where possible:
4x - 9y - 7x + 7y
4x - 9y - 7x + 7y
combine 4x and -7x = -3x
combine -9y and 7y = -2y
= -3x - 2y
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combine -9y and 7y = -2y
= -3x - 2y
See more combining like terms examples here
or
Ask Algebra House