https://s0.wp.com/latex.php?latex=%5Cdisplaystyle%C2%A0+%5Ctext%7Bv%29+%7D%5CBig%286+%C2%A0+%5Cfrac%7B4%7D%7B11%7D+%C2%A0+%5CBig%29%5E2-%5CBig%284+%C2%A0+%5Cfrac%7B7%7D%7B11%7D+%C2%A0+%5CBig%29%5E2+%3D+%5CBig%286+%C2%A0+%5Cfrac%7B4%7D%7B11%7D+%C2%A0+%2B4+%C2%A0+%5Cfrac%7B7%7D%7B11%7D+%C2%A0+%5CBig%29+%5CBig%286+%C2%A0+%5Cfrac%7B4%7D%7B11%7D+%C2%A0+-4%C2%A0+%5Cfrac%7B7%7D%7B11%7D+%C2%A0+%5CBig%29+%3D+11+%5Ctimes+1+%C2%A0+%5Cfrac%7B4%7D%7B11%7D+%C2%A0+%3D+19+&bg=%23ffffff&fg=%23111111&s=0&c=20201002