11a-b
35-7y+3y -21= 14-4y
12a-4c-5a+2c=7a-2c
4+x-2x-x+3=7-2x
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11a-b
35-7y+3y -21= 14-4y
12a-4c-5a+2c=7a-2c
4+x-2x-x+3=7-2x