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x/9+7=12
We move all terms to the left:
x/9+7-(12)=0
We add all the numbers together, and all the variables
x/9-5=0
We multiply all the terms by the denominator
x-5*9=0
We add all the numbers together, and all the variables
x-45=0
We move all terms containing x to the left, all other terms to the right
x=45
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