Solve number 25 pls i dont know how to put it into an equation

Equation to solve is x+x+120=180

Solution to equation: x=30

Step-by-step explanation:

The angles in a triangle have a sum 180 degrees.

You know one angle is 120 degrees.

If you assume another angle has a measurement of x degrees, then the remaining angle has a measurement of x degrees.  We know this because congruent means they will have the same measurement.

So we have this equation to solve:

x+x+120=180

Combine like terms:

2x+120=180

Subtract 120 on both sides:

2x=180-120

Simplify:

2x=60

Divide both sides by 2:

x=60/2

Simplify:

x=30

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12