(4/5 - x) + 13/20 = 25/30

To solve this equation, we first need to find a common denominator for 20 and 30. The least common multiple of 20 and 30 is 60. So, rewrite the equation with a common denominator of 60:

(48/60 - 60x/60) + 39/60 = 50/60

Now combine like terms:

(48 - 60x + 39) / 60 = 50 / 60

(87 - 60x) / 60 = 50 / 60

Cross multiply:

87 - 60x = 50

Add 60x to both sides:

87 = 60x + 50

Subtract 50 from both sides:

37 = 60x

Divide by 60:

x = 37/60

Therefore, the solution to the equation is x = 37/60.