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5x= 100
x=100/5
x= 20
misal di samping sudut 7y kita beri A
maka A= 5x. karena segaris
5x= 180-7y
5.20= 180-7y
100=180-7y
7y= 180-100
7y= 80
y= 80/7
semoga jadi yang terbaik :)
5x = 100°
x = 25°
100 + 7y = 180°
7y = 80°
y = 11 3 °
7