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21(11x+11)=2310
We move all terms to the left:
21(11x+11)-(2310)=0
We multiply parentheses
231x+231-2310=0
We add all the numbers together, and all the variables
231x-2079=0
We move all terms containing x to the left, all other terms to the right
231x=2079
x=2079/231
x=9
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