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x+(x+2)=-10
We move all terms to the left:
x+(x+2)-(-10)=0
We add all the numbers together, and all the variables
x+(x+2)+10=0
We get rid of parentheses
x+x+2+10=0
We add all the numbers together, and all the variables
2x+12=0
We move all terms containing x to the left, all other terms to the right
2x=-12
x=-12/2
x=-6
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