Angle C and Angle D are supplementary angles. If the measure of Angle D is nine less than twice the measure of Angle C, find the measure of Angle D.

PLEASE HELP!!! I have no idea where to even start!

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  1. "Angle D is nine less than twice the measure of Angle C"

    D = 2C - 9

    and we know C+D = 180 , so .....

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  2. D= 117
    C= 63

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