Помогите пожалуйста
1)-4(7-2x)+6(3x-5)=

2)2(a-2b)-7(2a+3b)=

3) (3m-2)•(-0,7)+(4-2m)•0,5

4)4,2(5x-2y)-2,7(3x-y)

пожалуйста​
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