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12x+45=6x+12
We move all terms to the left:
12x+45-(6x+12)=0
We get rid of parentheses
12x-6x-12+45=0
We add all the numbers together, and all the variables
6x+33=0
We move all terms containing x to the left, all other terms to the right
6x=-33
x=-33/6
x=-5+1/2
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