Cual es el insiso correcto, por que, y operación?

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

the answer is "add 2y and y"

step-by-step explanation:

you need to collect the like terms first.