Yes, 1/3x + 1/3x = 2/6(x + x). Units are absolutely necessary, and 'fractions' don't make sense without them. '1/3' without units is not a 'fraction' but inst

Yes, 1/3x + 1/3x = 2/6(x + x). Units are absolutely necessary, and 'fractions' don't make sense without them. '1/3' without units is not a 'fraction' but instead is 0.3333, a number on the number line, which is why it looks so wrong to see 1/3 + 1/3 = 2/6.