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Two supplementary angles have the following measures: m ABC = 135 degrees and m CBD = 9x degrees. What is the equation to solve for x?

A. 9x degrees + 135 degrees = 90 degrees
B. 9x degrees + 135 degrees = 180 degrees
C. 9x degrees = 180 degrees
D. 9x degrees - 135 degrees = 180 degrees

1 answer

B. 9x degrees + 135 degrees = 180 degrees
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