usuń nawiasy i zredukuj wyrazy 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) proszę pilne!!!

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

a)5x+(2x-7) - 9x-(-3x+8) + 20 -8x=5x+2x-7-9x+3x+8=x+1 b) -5x+(2y+4x) -(7x-8y) -x+(2-6y)=-5x+2y+4x-7x-8y-x+2-6y=-9x-12y+2 c) -9z-(4-3z) - 8y-(-7z+8y)+(-2y-7)=-9z-4-3z-8y+7z+8y-2y-7=-5z-2y-11