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21x-75=x-(51)
We move all terms to the left:
21x-75-(x-(51))=0
We get rid of parentheses
21x-x+51-75=0
We add all the numbers together, and all the variables
20x-24=0
We move all terms containing x to the left, all other terms to the right
20x=24
x=24/20
x=1+1/5
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