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5x-20=180|+20
5x=200|/5
x=40
40-20=20
3*40=120
A=40
B=20
C=120
40+20+120=180
zgadza sie
B->x
C->3(x+20)
x+20+x+3x+60=180
5x+80=180
5x=100
x=20
A->40
B->20
C->3*40=120
kąt B=x
kąt C=3(x+20)
3(x+20)+(x+20)+x=180
3x+60+x+20+x=180
5x=100
x=20
kąt a=40
kąt b=20
kąt c=120