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I don't know how to do this

I don't know how to do this-example-1

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4 votes
I'll explain why, and you can put it in a two column proof as you wish due to that I don't know how to do them :P

Expanding it, we get x^2+3x-15=3x+10. After that, we can subtract 3x from both sides as well as subtract 10, getting x^2-25=0, and x^2=25. Therefore,
x= +-sqrt(25)=+-5
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