x2
x
=0
7x2
7x2-20x
7x2-19x
7x2-18x
7x2-17x
7x2-16x
7x2-15x
7x2-14x
7x2-13x
7x2-12x
7x2-11x
7x2-10x
7x2-9x
7x2-8x
7x2-7x
7x2-6x
7x2-5x
7x2-4x
7x2-3x
7x2-2x
7x2-x
7x2+x
7x2+2x
7x2+3x
7x2+4x
7x2+5x
7x2+6x
7x2+7x
7x2+8x
7x2+9x
7x2+10x
7x2+11x
7x2+12x
7x2+13x
7x2+14x
7x2+15x
7x2+16x
7x2+17x
7x2+18x
7x2+19x
7x2+20x
7x2+21x
7x2+22x
7x2+23x