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42=x/21
We move all terms to the left:
42-(x/21)=0
We add all the numbers together, and all the variables
-(+x/21)+42=0
We get rid of parentheses
-x/21+42=0
We multiply all the terms by the denominator
-x+42*21=0
We add all the numbers together, and all the variables
-1x+882=0
We move all terms containing x to the left, all other terms to the right
-x=-882
x=-882/-1
x=+882
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