Упростите выражение и найдите его значение:
2(a-3b)+3a+b , если a-b=4;
4(0,3x-2y)+7,8x-y, если x-y=0,5;
3(2c-3d)+2(2,5c-d), если c-d=3;
5(3x+y)+2(7x+12y), если x+y=1.
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