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6x+12=x+9
We move all terms to the left:
6x+12-(x+9)=0
We get rid of parentheses
6x-x-9+12=0
We add all the numbers together, and all the variables
5x+3=0
We move all terms containing x to the left, all other terms to the right
5x=-3
x=-3/5
x=-3/5
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