2x - 7y + (5x - 2y) = 2x - 7y + 5x - 2y = 7x - 9y
- (2p - r) - (2r - p) = -2p + r - 2r + p = -p - r
3x - (y - 2x) = 3x - y + 2x = 5x - y
7 - (5x + 4) = 7 - 5x - 4 = -5x + 3
-8m + (2n - m) = -8m + 2n - m = -9m + 2n
-2x + 8y - (6x - 7y) = -2x + 8y -6x + 7y = -8x + 15y
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2x - 7y + (5x - 2y) = 2x - 7y + 5x - 2y = 7x - 9y
- (2p - r) - (2r - p) = -2p + r - 2r + p = -p - r
3x - (y - 2x) = 3x - y + 2x = 5x - y
7 - (5x + 4) = 7 - 5x - 4 = -5x + 3
-8m + (2n - m) = -8m + 2n - m = -9m + 2n
-2x + 8y - (6x - 7y) = -2x + 8y -6x + 7y = -8x + 15y