2x+x+2x-20=180 /+20
5x=200/:5
x=40
2*40+40+2*40-20=200-20=180
1 kąt ma 80
2 ma 40
3 ma 60
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2x+x+2x-20=180 /+20
5x=200/:5
x=40
2*40+40+2*40-20=200-20=180
1 kąt ma 80
2 ma 40
3 ma 60