Объяснение:
2+5(4m-1)=2+20m-5=20m-3
6-5(-y-2)=6+5y+10=5y+16
-7(a+1)+7a=-7a-7+7a=-7
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Объяснение:
2+5(4m-1)=2+20m-5=20m-3
6-5(-y-2)=6+5y+10=5y+16
-7(a+1)+7a=-7a-7+7a=-7