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8.3(x/3.1)=83
We move all terms to the left:
8.3(x/3.1)-(83)=0
We add all the numbers together, and all the variables
8.3(+x/3.1)-83=0
We multiply parentheses
8.3x-83=0
We move all terms containing x to the left, all other terms to the right
8.3x=83
x=83/8.3
x=10
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