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3+x+2(x-2)=3+x+2x-4=3x-1
3+x≥0 więc |3+x|=3+x
x-2≤0 więc |x-2|=-x+2 stąd
|3+x|-2|x-2|=3+x-2*(-x+2)=3+x+2x-4=3x-1