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25x-18=21x+6
We move all terms to the left:
25x-18-(21x+6)=0
We get rid of parentheses
25x-21x-6-18=0
We add all the numbers together, and all the variables
4x-24=0
We move all terms containing x to the left, all other terms to the right
4x=24
x=24/4
x=6
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