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5+x/9=21
We move all terms to the left:
5+x/9-(21)=0
We add all the numbers together, and all the variables
x/9-16=0
We multiply all the terms by the denominator
x-16*9=0
We add all the numbers together, and all the variables
x-144=0
We move all terms containing x to the left, all other terms to the right
x=144
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