There are four angles, a,b,c,d. The measure of angle a is (3x+10) degrees. The measure of angle d is (x+10).What is the value of x?

I made an equation 3x+10=x+10. I think the value is 0.

you don't have enough information.

Your equation assumes that angle a and d are equal.
Where did it state that?
How are the 4 angles related?
Are they the angles of a quadrilateral??
???
??

They are vertical angles.

that still tells me nothing

is there a geometrical figure?
What do you mean by vertical angles?

To solve for the value of x, you correctly set up the equation 3x + 10 = x + 10. Now, let's simplify and solve for x.

First, we can simplify the equation by subtracting x from both sides:
3x + 10 - x = x + 10 - x
This simplifies to:
2x + 10 = 10

Next, subtract 10 from both sides of the equation:
2x + 10 - 10 = 10 - 10
This simplifies to:
2x = 0

Finally, divide both sides of the equation by 2 to isolate x:
2x / 2 = 0 / 2
This simplifies to:
x = 0

So, you are correct. The value of x in this equation is indeed 0.