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9x-3x+99=9x+51
We move all terms to the left:
9x-3x+99-(9x+51)=0
We add all the numbers together, and all the variables
6x-(9x+51)+99=0
We get rid of parentheses
6x-9x-51+99=0
We add all the numbers together, and all the variables
-3x+48=0
We move all terms containing x to the left, all other terms to the right
-3x=-48
x=-48/-3
x=+16
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