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3+3x+66=12x+30
We move all terms to the left:
3+3x+66-(12x+30)=0
We add all the numbers together, and all the variables
3x-(12x+30)+69=0
We get rid of parentheses
3x-12x-30+69=0
We add all the numbers together, and all the variables
-9x+39=0
We move all terms containing x to the left, all other terms to the right
-9x=-39
x=-39/-9
x=4+1/3
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