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31x-46=4x+21
We move all terms to the left:
31x-46-(4x+21)=0
We get rid of parentheses
31x-4x-21-46=0
We add all the numbers together, and all the variables
27x-67=0
We move all terms containing x to the left, all other terms to the right
27x=67
x=67/27
x=2+13/27
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