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I had help but still don't understand plz help

I had help but still don't understand plz help-example-1
User S M Kamran
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2 Answers

5 votes
These are corresponding angle and they equal each other.
So you can say 9x + 21 = 10x +10 and then solve for x......

Is this enough help?
User Detzu
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5 votes
Add like variables like everything with the x add up and then add up the numbers without the variables for example the answer is =19x +31
User Motti Shneor
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