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3(10^x-3)=300
We move all terms to the left:
3(10^x-3)-(300)=0
We multiply parentheses
30x-9-300=0
We add all the numbers together, and all the variables
30x-309=0
We move all terms containing x to the left, all other terms to the right
30x=309
x=309/30
x=10+3/10
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