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20x+5=21x+1
We move all terms to the left:
20x+5-(21x+1)=0
We get rid of parentheses
20x-21x-1+5=0
We add all the numbers together, and all the variables
-1x+4=0
We move all terms containing x to the left, all other terms to the right
-x=-4
x=-4/-1
x=+4
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