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Need help I don’t really understand it

Need help I don’t really understand it-example-1

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Because the sum of angles in a triangle is always 180 degrees, we can add all the angles given to get the equation:

6x+3+90+2x-9=180 (degrees)
This simplifies to 8x+84=180
So then, 8x=96 and x=12
User Dperish
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