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2.7(2-a-3b)=14-7a-21b
3.(15a+20):5=(3a+4)5 :5=3a+4
4.(3s-12t+9):3= (s-4t+3)3:3=s-4t+3
5.2(2a+5-0,1b)= 4a+10-0,2b
6.-2(3b-4a+0,5)=-6b+8a-1
7.0,3(x-7y+2)=0,3y-2,1y+0,6
8.(-8m+4m-12) :4=(-2m+m-3)4 :4=-m-3
9.(6x-2y+10):2=(3x-y+5)2 : 2=3x-y+5
10.(14p-21) :(-7)= (-2p+3)*(-7) :(-7)=-2p+3