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I need help doing this ! how do you do it?

I need help doing this ! how do you do it?-example-1
User ScottyC
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1 Answer

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first u must find the x .. the straight line must be 180 . so u can find the x which is
13x-20+7x= 180(the straight line)
I need help doing this ! how do you do it?-example-1
User Maxcot
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