3 ms·You do this by including units. 1/3 + 1/3 = 2/3. And here, 1/3x + 1/3y = 2/6(x+y).by GavinMcG 6y agoYou do this by including units. 1/3 + 1/3 = 2/3. And here, 1/3x + 1/3y = 2/6(x+y).