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2. dobrze
3. = x + 2
4. = (x+y)
5. = 2x + y
3a²-12ab= 3a(a-4b)
4x+8:2 - 3x-6:3 =4x+4-3x-2=x+2
-2 (x-y)+3 (x+y) = -2x+2y+3x+3y=x+5y
(3x-y) - (2x-3y)+(x-y)== 3x-y - 2x+3y+x-y=2x+y