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-5a +3b +7c -(3a -7b -4c)
-5a +3b +7c -3a +7b +4c
-5a -3a +3b +7b +7c +4c
-8a +10b +11c
2. 5x -7y -(8x +2y)
5x -7y -8x -2y
5x -8x -7y -2y
-3x -9y