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jadi, <A + <B = 180
7x + 8 + 5x + 4 = 180
12x +12 = 180
12x = 180 - 12
12 x = 168
x = 168 :12 = 14
jadi, <A = 7x + 8
<A = (7 x 14) + 8 = 98 +8 = 106 derajat (A)