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20x+10=121-10x
We move all terms to the left:
20x+10-(121-10x)=0
We add all the numbers together, and all the variables
20x-(-10x+121)+10=0
We get rid of parentheses
20x+10x-121+10=0
We add all the numbers together, and all the variables
30x-111=0
We move all terms containing x to the left, all other terms to the right
30x=111
x=111/30
x=3+7/10
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