Упростить выражение:
1)1.2a-(0.2a+b);
2)0.7x-(2y-0.7x);
3)0.1(x-2y)+0.2(x+y)
4)2/3(m-3n)+1/3(n-2m)
5)8(a+3b)-9(a+b)
6)3(c+d)-7(d+2c)
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