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125=21x-1
We move all terms to the left:
125-(21x-1)=0
We get rid of parentheses
-21x+1+125=0
We add all the numbers together, and all the variables
-21x+126=0
We move all terms containing x to the left, all other terms to the right
-21x=-126
x=-126/-21
x=+6
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