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jadi
<ABC + <DCB = 180
5x + 21 + 2x-2 = 180
7x + 19 = 180
7x = 180-19
7x = 161
x = 161 : 7
x = 23
<BCD = 2x - 2
<BCD = 2(23) - 2
<BCD = 46 - 2 = 44
7x + 19 = 180
7x = 180 - 19
7x = 161
x = 161 : 7
x = 23
jadi, sudut BCD = 2x - 2
= 2(23) - 2
= 46 - 2
= 44⁰
maaf kalo salah :)