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x^2-3x+85=x^2+10x-19
We move all terms to the left:
x^2-3x+85-(x^2+10x-19)=0
We get rid of parentheses
x^2-x^2-3x-10x+19+85=0
We add all the numbers together, and all the variables
-13x+104=0
We move all terms containing x to the left, all other terms to the right
-13x=-104
x=-104/-13
x=+8
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