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6x-31=4x+21
We move all terms to the left:
6x-31-(4x+21)=0
We get rid of parentheses
6x-4x-21-31=0
We add all the numbers together, and all the variables
2x-52=0
We move all terms containing x to the left, all other terms to the right
2x=52
x=52/2
x=26
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