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5x-21=x+30
We move all terms to the left:
5x-21-(x+30)=0
We get rid of parentheses
5x-x-30-21=0
We add all the numbers together, and all the variables
4x-51=0
We move all terms containing x to the left, all other terms to the right
4x=51
x=51/4
x=12+3/4
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