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lub
7x-0
nie pamętam dokładnie:((((
x-{x-x+(x+1)+(x-1)+x+1-x}=
x-{x+1+x-1+1}=
x-(2x+1)=
x-2x-1=
-x-1
x-{x-[x- x - 1 - x + 1 - x] + 1 - x} =
x-{x-[-2x] + 1 - x} =
x-{x+2x + 1 - x} =
x - x - 2x - 1 + x = -3x - 1