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9(x+12)=199
We move all terms to the left:
9(x+12)-(199)=0
We multiply parentheses
9x+108-199=0
We add all the numbers together, and all the variables
9x-91=0
We move all terms containing x to the left, all other terms to the right
9x=91
x=91/9
x=10+1/9
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