To solve the equation -2/15 - x = -3/10, we can start by getting rid of the fractions.

First, let's find a common denominator for the fractions -2/15 and -3/10. The least common multiple (LCM) of 15 and 10 is 30.

Next, we need to rewrite the fractions with the common denominator of 30.

-2/15 = -4/30
-3/10 = -9/30

Now, the equation becomes:

-4/30 - x = -9/30

To simplify the equation, we can subtract -4/30 from both sides:

-4/30 - x + 4/30 = -9/30 + 4/30

This simplifies to:

-x = -5/30

Now, let's simplify the right side of the equation:

-x = -1/6

To solve for x, we can multiply both sides of the equation by -1:

(-1)(-x) = (-1)(-1/6)

This gives us:

x = 1/6

Therefore, the solution to the equation -2/15 - x = -3/10 is x = 1/6.