Упростите выражения:
5)-4(x-y)+2(x+3y)
6)2(a-b)-4(b-a)
7)3,2(c+d)+5,8(c-d)
8)2/9(1,8m-5,4)-3/7(2,1m-4,2)
Пожалуйста , помогите
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