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11a + 10 = 180
(3a - 11a+ 20 +10 )
- 8a + 30 = 90
-8a = -90 - 30
-8a= -120
a = 120÷8 = 15
Sudut A = 90-( 3×15 + 20 )
= 90 - ( 45+20)
= 90 - 65
= 25