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6(3x-3)=90
We move all terms to the left:
6(3x-3)-(90)=0
We multiply parentheses
18x-18-90=0
We add all the numbers together, and all the variables
18x-108=0
We move all terms containing x to the left, all other terms to the right
18x=108
x=108/18
x=6
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