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x+x+2x+23=-2x-31
We move all terms to the left:
x+x+2x+23-(-2x-31)=0
We add all the numbers together, and all the variables
4x-(-2x-31)+23=0
We get rid of parentheses
4x+2x+31+23=0
We add all the numbers together, and all the variables
6x+54=0
We move all terms containing x to the left, all other terms to the right
6x=-54
x=-54/6
x=-9
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