a) 2x=213°+37°=150°
x=150:2=75°
b)x=85°49-47°33`
x= 38°16`
c)3•(x-12°7`) + 41°=161°30'
3•(x-12°7`) = 161°30`-41°=120°30'
x-12°7' = 120°30:3=40°10'
x=40°10'+12°7'=52°17
d) 2x=213°-37°=176°
x=88
e)525°35`:x =5
5x=525°35
x= 105°7
f) x:8+15°40'=30°
x:8 = 30° => 29°60'
x:8 = 29°60'-15°40'
x:8 = 14°20
x= 14°20'•8
x= 112°160' => 114°40'
