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3x+51=6x+9
We move all terms to the left:
3x+51-(6x+9)=0
We get rid of parentheses
3x-6x-9+51=0
We add all the numbers together, and all the variables
-3x+42=0
We move all terms containing x to the left, all other terms to the right
-3x=-42
x=-42/-3
x=+14
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