3 years ago

Help I'll make you a Brainlest

Mathematics

1 answer:

melomori [17]3 years ago

7 0

Answer:

x = 13

Step-by-step explanation:

m∠ABC + m∠CBD = 180° {linear pair}

3x + 43 + 6x + 20 = 180

3x + 6x + 43 + 20 = 180

9x + 63 = 180

9x = 180 - 63

9x = 117

x = 117/9

x = 13

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