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571=121+6x
We move all terms to the left:
571-(121+6x)=0
We add all the numbers together, and all the variables
-(6x+121)+571=0
We get rid of parentheses
-6x-121+571=0
We add all the numbers together, and all the variables
-6x+450=0
We move all terms containing x to the left, all other terms to the right
-6x=-450
x=-450/-6
x=+75
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