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3x^2+2x-1=3x^2-11
We move all terms to the left:
3x^2+2x-1-(3x^2-11)=0
We get rid of parentheses
3x^2-3x^2+2x+11-1=0
We add all the numbers together, and all the variables
2x+10=0
We move all terms containing x to the left, all other terms to the right
2x=-10
x=-10/2
x=-5
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