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6x=4.5x+12
We move all terms to the left:
6x-(4.5x+12)=0
We get rid of parentheses
6x-4.5x-12=0
We add all the numbers together, and all the variables
1.5x-12=0
We move all terms containing x to the left, all other terms to the right
1.5x=12
x=12/1.5
x=8
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