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25x-11=21x+9
We move all terms to the left:
25x-11-(21x+9)=0
We get rid of parentheses
25x-21x-9-11=0
We add all the numbers together, and all the variables
4x-20=0
We move all terms containing x to the left, all other terms to the right
4x=20
x=20/4
x=5
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