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(2x+9) + (10x+15) = 180°
2x+9 + 10x+15 = 180°
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12x+24 = 180°
-24 on both sides
12x = 156°
/12 on both sides
x = 13

< ABC = (2x+9)
< ABC = 2(13)+9
Answer : < ABC = 35°

< CBD = (10x+15)
< CBD = 10(13)+15
Answer: < CBD = 145°
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