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9x=21x+14
We move all terms to the left:
9x-(21x+14)=0
We get rid of parentheses
9x-21x-14=0
We add all the numbers together, and all the variables
-12x-14=0
We move all terms containing x to the left, all other terms to the right
-12x=14
x=14/-12
x=-1+1/6
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