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x+6=-2x=3
We move all terms to the left:
x+6-(-2x)=0
We get rid of parentheses
x+2x+6=0
We add all the numbers together, and all the variables
3x+6=0
We move all terms containing x to the left, all other terms to the right
3x=-6
x=-6/3
x=-2
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