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-10x+5x^2=-10x+5x^2
We move all terms to the left:
-10x+5x^2-(-10x+5x^2)=0
We get rid of parentheses
5x^2-5x^2+10x-10x=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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