A triangle has one angle measuring 3X degrees a second angle measures 2X + 20°

And the third angle measures 4X - 20° what is the value of X

Answer : x = 20

Explanation:

3x + 2x + 20 + 4x - 20 = 180

(3+2+4=9)

9x + 20 - 20

The 20s cancel each other out because one is positive and the other is negative

9x = 180

9x/9 = 180/9

X = 180 divided by 9

X = 20