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5x=21+3x
We move all terms to the left:
5x-(21+3x)=0
We add all the numbers together, and all the variables
5x-(3x+21)=0
We get rid of parentheses
5x-3x-21=0
We add all the numbers together, and all the variables
2x-21=0
We move all terms containing x to the left, all other terms to the right
2x=21
x=21/2
x=10+1/2
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