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2x=-30-x
We move all terms to the left:
2x-(-30-x)=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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