SOLUTION: the measure of angle n is 18 less than twice the measure of its supplement. find the measure of angle n

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Question 465210: the measure of angle n is 18 less than twice the measure of its supplement. find the measure of angle n
Answer by MathLover1(20850) About Me  (Show Source):
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Two angles are called supplementary angles if the sum of their degree measurements equals 180 degrees. One of the supplementary angles is said to be the supplement of the other.
n%2Bn1=180.....->...n1=180-n
given: n is 18 less than twice the measure of its supplement 180-n
n%2B18=n1
n%2B18=180-n
2n=180-18
2n=162
n=162%2F2

n=81......and its supplementary angle is n1=180-81=99
check:
n%2B18=n1
81%2B18=99
99=99