usuń nawiasy i zredukuj podobne. a) 5x+(2x-7)-9x-(-3x+8)+20_8x= b) -5x+(-2y+4x)-(7x-8y)-x+(2-6y)= c) -9z-(4-3z)-8y-(-7z+8y)+(-2y-7)= daje naj ;)

a) 5x+(2x-7)-9x-(-3x+8)+20-8x= 5x+2x-7-9x+3x-8+20-8x=-7x+5 b) -5x+(-2y+4x)-(7x-8y)-x+(2-6y)=-5x-2y+4x-7x+8y-x+2-6y=-13x+2 c) -9z-(4-3z)-8y-(-7z+8y)+(-2y-7)=-9z-4+3z-8y+7z-8y-2y-7=-18y+z-11

a) 5x+(2x-7)-9x-(-3x+8)+20_8x= 5x+2x-7-9x+3x-8+20-8x=-7x+5 b) -5x+(-2y+4x)-(7x-8y)-x+(2-6y)=-5x-2y+4x-7x+8y-x+2-6y=-9x+2 c) -9z-(4-3z)-8y-(-7z+8y)+(-2y-7)= -9z-4+3z-8y+7z-8y-2y-7=z-18y-11