Thirteen more than three times a number is equal to the difference between - 29 and three times the number.

-7

Step-by-step explanation:

Thirteen more than three times a number can be written as (3x+13).

The difference between - 29 and three times the number can be written as (-29-3x).

Then set them equal and solve.

3x+13 = (-29) (-3x)

3x = (-42) (-3x)

6x = (-42)

x=-7