Ответ:
7x-7y-6x+9y=-1x+2y
-12+3y+2y-8=-20+5y
6a-15a-2a+6a=-5a
10x-20y-5x-5y=5x-25y
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Ответ:
7x-7y-6x+9y=-1x+2y
-12+3y+2y-8=-20+5y
6a-15a-2a+6a=-5a
10x-20y-5x-5y=5x-25y