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x+10°- drugi kąt
x+10°+10°- trzeci kąt
x+x+10°+x+10°+10°=180°
3*x+30°=180°
3*x=180°-30°
3*x=150°
x=50°
50°; 50°+10°=60° ; 50°+10°+10°=70°