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7x = 161
x = 23
besar pelurus artinya kebalikan dari soalnya
contoh : disuruh cari AOC, tapi yg kita hitung adalah BOC
JADI...
BOC = 4x + 25
= 4(23) + 25
= 117 derajat
seingatku begitu sih
12) 2x - 2 + 4x + 2 = 180
6x = 180
x = 30
DBC = 4x + 2
= 4(30) + 2
= 120 + 2
= 122 derajat