Упростите выражение и найдите его значение:

2) 4(0,3x-2y)+7,8x-y если x-y=0,5

3)3(2c-3d)+2(2,5c-d) если c-d=3

4)5(3x+y)+2(7x+12y) если x+y=1

Срочно!
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