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A and ZB are supplementary angles. If mA = (x − 9)° and m
B=(7x+21)°, then find the measure of Z
![A And ZB Are Supplementary Angles If MA X 9 And M B7x21 Then Find The Measure Of Z class=](https://us-static.z-dn.net/files/d70/af179aba480ea01a380bdc4a74fd52f5.png)