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7y + 5y = 180°
12y = 180°
y = 15°
...
<A1 = 15 x 7
= 105°
...
<B3 = <A1
4x - 11 = 105°
4x = 116°
x = 29°
Jadi jawabannya adalah C. 29
maaf bila ada kesalahan