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5x-21=31+3x
We move all terms to the left:
5x-21-(31+3x)=0
We add all the numbers together, and all the variables
5x-(3x+31)-21=0
We get rid of parentheses
5x-3x-31-21=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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