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9x-(2x-3)=66
We move all terms to the left:
9x-(2x-3)-(66)=0
We get rid of parentheses
9x-2x+3-66=0
We add all the numbers together, and all the variables
7x-63=0
We move all terms containing x to the left, all other terms to the right
7x=63
x=63/7
x=9
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