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x^2+3x+83=x^2+8x+102
We move all terms to the left:
x^2+3x+83-(x^2+8x+102)=0
We get rid of parentheses
x^2-x^2+3x-8x-102+83=0
We add all the numbers together, and all the variables
-5x-19=0
We move all terms containing x to the left, all other terms to the right
-5x=19
x=19/-5
x=-3+4/5
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