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5a+7a=180-4-8
a=168/12
a=14°
cbd=7a+8=106°
7.4x+15+3x+10+2x+5+x=
180
4x+3x+2x+x=180-15-10-5
x=150/10
x=15°
coe=3x+10+2x+5=
45+10+30+5=90°
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