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-66+9x=66-3x
We move all terms to the left:
-66+9x-(66-3x)=0
We add all the numbers together, and all the variables
9x-(-3x+66)-66=0
We get rid of parentheses
9x+3x-66-66=0
We add all the numbers together, and all the variables
12x-132=0
We move all terms containing x to the left, all other terms to the right
12x=132
x=132/12
x=11
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