Question

m/3 + 1/3= 2/3 How do I solve?

Answer 1

Well if you notice, they have the same denominator, so add the numerators. it will give you:
(m+1)/3= 2/3
Now you can multiply both sides by 3 and you are left with
m+1=2 and so you get m=1

Answer 2

m/3 + 1/3 = 2/3 (subtract 1/3 from both sides)
m/3 = 2/3 - 1/3
m/3 = 1/3 (now multiply the equation by 3)
m = 1