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9(3+2x)=99
We move all terms to the left:
9(3+2x)-(99)=0
We add all the numbers together, and all the variables
9(2x+3)-99=0
We multiply parentheses
18x+27-99=0
We add all the numbers together, and all the variables
18x-72=0
We move all terms containing x to the left, all other terms to the right
18x=72
x=72/18
x=4
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