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6.6(x+10)=99
We move all terms to the left:
6.6(x+10)-(99)=0
We multiply parentheses
6.6x+66-99=0
We add all the numbers together, and all the variables
6.6x-33=0
We move all terms containing x to the left, all other terms to the right
6.6x=33
x=33/6.6
x=5
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