The angles of a triangle are 99º, 3xº, and x + 5º. What is the value of x? Enter your answer in the box.

(99) + (3x) + (x + 5) = 180 because the always in a triangle must always add up to 180.

Now just have to isolate x:

First add the like terms:

104 + 4x = 180

Subtract 104 on both sides:

4x = 76

Divide by 4:

x = 19