Упростите выражение:
1) - 4(х - y) + 2(х+3y);
2) 2(а - b) - 4(b - а);
3) 3,2(с + d) + 5,8(с - d);
4) 2/9(1,8m - 5,4) - 3/7(2,1m - 4,2).

Заранее большое вам спасибо!!!
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