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2x + y = 180
2x + 3x = 180
5x = 180 :5
----------
x = 36
y = 3x
y = 3*36
y = 108
= 2*36
= 72
= 36
= 108
= 360 - ( 72 + 36 + 108 )
= 360 - ( 108 + 108 )
= 360 - 216
= 144 (a.) jawabannya