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9x+10=21x+1
We move all terms to the left:
9x+10-(21x+1)=0
We get rid of parentheses
9x-21x-1+10=0
We add all the numbers together, and all the variables
-12x+9=0
We move all terms containing x to the left, all other terms to the right
-12x=-9
x=-9/-12
x=3/4
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