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123=31x-63
We move all terms to the left:
123-(31x-63)=0
We get rid of parentheses
-31x+63+123=0
We add all the numbers together, and all the variables
-31x+186=0
We move all terms containing x to the left, all other terms to the right
-31x=-186
x=-186/-31
x=+6
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