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6x-54=x+15
We move all terms to the left:
6x-54-(x+15)=0
We get rid of parentheses
6x-x-15-54=0
We add all the numbers together, and all the variables
5x-69=0
We move all terms containing x to the left, all other terms to the right
5x=69
x=69/5
x=13+4/5
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