Сократите как можно больше примеры:
1) -2(x-3y+2)+4(2x-5y+7)
2)4(x-2y-3)-4(y-5x-1)
3)-(a-b-2c-4d)-(a+b-c+d)
4)-4(x+7y-11)+3x-12(x+y)
5)3x-2(x-5y-5)-3(x-y)
6)-3(x-5y-z)+4(2z-6x-2y)
Помогите пожалуйста, даю 30 баллов.
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