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x+x=-x+30
We move all terms to the left:
x+x-(-x+30)=0
We add all the numbers together, and all the variables
x+x-(-1x+30)=0
We add all the numbers together, and all the variables
2x-(-1x+30)=0
We get rid of parentheses
2x+1x-30=0
We add all the numbers together, and all the variables
3x-30=0
We move all terms containing x to the left, all other terms to the right
3x=30
x=30/3
x=10
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