8x+ 18 + 3x-3 = 180 straight line
combine like terms
11x+15 = 180
subtract 15 from each side
11x = 165
divide by 11
x = 15
<rsu = 8x+18
= 8*15+18 = 138
< ust = 3x-3
= 3*15-3 = 42
