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7x-9=99-5x
We move all terms to the left:
7x-9-(99-5x)=0
We add all the numbers together, and all the variables
7x-(-5x+99)-9=0
We get rid of parentheses
7x+5x-99-9=0
We add all the numbers together, and all the variables
12x-108=0
We move all terms containing x to the left, all other terms to the right
12x=108
x=108/12
x=9
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