To solve this equation, we need to combine like terms on the left side:

3/5x + 3/20x + 1/4x = 2/7

To combine the fractions, we need to find a common denominator. The least common multiple of 5, 20, and 4 is 20.

So, we need to rewrite each fraction with a denominator of 20:

(12/20)x + (3/20)x + (5/20)x = 2/7

Now, we can add the fractions:

(12/20 + 3/20 + 5/20)x = 2/7

(20/20)x = 2/7

Now, we can simplify:

x = 2/7

Therefore, the solution to the equation is x = 2/7.