Question

Answer with solution

Answer 1

Explanation:

First set up an equasion

180 (angles added together) = x+20 + 210-3x + x

then simplify

180 = 230 + x + x -3x

180 = 230 - x

then subtract 230

180 - 230 = -50 = -x

divide -1 from the x

50 = x

check

50 + (50 + 20) + (210 - (3*50)) = 180