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(6x-3)*3=207
We move all terms to the left:
(6x-3)*3-(207)=0
We multiply parentheses
18x-9-207=0
We add all the numbers together, and all the variables
18x-216=0
We move all terms containing x to the left, all other terms to the right
18x=216
x=216/18
x=12
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