1) =2(2-а+3+2а)=2(5+а)
2)=2(6-4х+12-3-2х)=2(15-6х)=6(3-2х)
3)=-15m-9n+8m-28n=-(7m-37n)
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2) 2x 2x
3)5m -2m, 3n 7n
1) =2(2-а+3+2а)=2(5+а)
2)=2(6-4х+12-3-2х)=2(15-6х)=6(3-2х)
3)=-15m-9n+8m-28n=-(7m-37n)