To solve the equation 1/3 + x - 2/5 = 3/4, we need to find the value of x.

First, let's simplify the equation by finding a common denominator for all the fractions involved. The least common denominator (LCD) for 3, 5, and 4 is 60.

Multiplying each term by 60, we get:

(60 * 1/3) + (60 * x) - (60 * 2/5) = (60 * 3/4)

20 + 60x - 24 = 45

Combine like terms:

60x - 4 = 45 - 20

60x - 4 = 25

Add 4 to both sides:

60x = 25 + 4

60x = 29

Divide both sides by 60:

x = 29/60

Therefore, the solution to the equation 1/3 + x - 2/5 = 3/4 is x = 29/60.