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2x+30=12+x
We move all terms to the left:
2x+30-(12+x)=0
We add all the numbers together, and all the variables
2x-(x+12)+30=0
We get rid of parentheses
2x-x-12+30=0
We add all the numbers together, and all the variables
x+18=0
We move all terms containing x to the left, all other terms to the right
x=-18
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