Answer:
x=5
Explanation:
USE=UST+EST
180=UST+22x+3 ==> USE is a straight line, and straight lines measure 180 degrees and are called straight angles.
UST+6x+4+79=180 ==> 180 is the sum of all three angles in a triangle
UST+22x+3=UST+6x+4+79 ==> they both equal 180
22x+3=6x+4+79 ==> subtract UST on both sides
22x+3=6x+83
22x+3-3=6x+83-3
22x=6x+80
22x-6x=6x-6x+80
16x=80
x=80/16
x=5