Упростите выражения:
1. 0,5(a+b)+0,2(b+a)=
2. -1,4(x+2y)-5(x-y)=
3. 1/5(1/2-1/3y)-1/3(y+2)=
4. 6a-(2a-4b)+2b=
5. 5,3p-0,7q+0,8p-1,3q=
6. 13/18(3a+6b)-4/9(6a-3b)=
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