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(4x+20) berpelurus dengan 60°
4x+20+60 =180
4x=180-80
4x/4=100/4
x=25
<=> 4x°+80° =180°
<=> 4x° =180°-80°
<=> 4x° =100°:4
<=> x° =25° (B)
catatan : 60° berasal dari 180-(70+50)°
smoga bermanfaat