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x=312x-7
We move all terms to the left:
x-(312x-7)=0
We get rid of parentheses
x-312x+7=0
We add all the numbers together, and all the variables
-311x+7=0
We move all terms containing x to the left, all other terms to the right
-311x=-7
x=-7/-311
x=7/311
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