Since ∠ABC and ∠CBD are supplementary angles, their measures sum up to 180°. Therefore, we can write the equation:
m∠ABC + m∠CBD = 180°
Substituting the given values:
135° + 9x° = 180°
Two supplementary angles have the following measures: m∠ABC=135° and m∠CBD=9x° . What is the equation to solve for x ?
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