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12x-61=6x-31
We move all terms to the left:
12x-61-(6x-31)=0
We get rid of parentheses
12x-6x+31-61=0
We add all the numbers together, and all the variables
6x-30=0
We move all terms containing x to the left, all other terms to the right
6x=30
x=30/6
x=5
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