To solve the equation 1/3(x-1) + 1/(x+2) = 0.25, we need to find the value of x that satisfies the equation.

First, let's simplify the equation by finding a common denominator for the fractions:

1/3(x-1) + 1/(x+2) = 0.25

Multiply the first fraction by (x+2) and the second fraction by 3:

(x+2)/(3(x-1)) + 3/(3(x+2)) = 0.25

Now, combine the fractions:

(x+2 + 3)/(3(x-1)) = 0.25

Simplify the numerator:

(x+5)/(3(x-1)) = 0.25

Now, cross multiply:

0.25 * (3(x-1)) = (x+5)

0.75(x-1) = x+5

Distribute 0.75:

0.75x - 0.75 = x + 5

Combine like terms:

0.75x - x = 5 + 0.75

-0.25x = 5.75

Divide both sides by -0.25:

x = 5.75 / -0.25

x = -23

Therefore, the solution to the equation is x = -23.