1)
2x-37°=243°
2x=243°+37°
2x=280°
x=280°:2
x=140°
x+47° 33'=85° 49' 27''
x=85° 49' 27''-47° 33'
x=38° 16' 27''
3•(x-12° 7' 20'')+41°=160° 30'
3•(x-12° 7' 20'')=160° 30'-41°
3•(x-12° 7' 20'')=119° 30'
x-12° 7' 20''=119° 30':3
x-12° 7' 20''=39° 30'
x=39° 30'+12° 7' 20''
x=51° 37' 20''
2)
90° 45'-35° 20'=70° 25'
15° 7' 10'':2=7° 33' 35''
20° 8' 15''•5=100° 41' 15''
161°:2=80° 30'
75° 15'+30° 5'=105° 20'
