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180= 12 a +12
180-12 =12a
168: 12 = a
14 =a
DBC =7a + 8
=7 x 14 + 8
=98 + 8
=106
12a= 180-12
12a=168
a=168/12 = 14
DBC= 7a+8
=7(14)+8
=98 + 8
=106° (b)
semoga membantu^^