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3x+45=9x+51
We move all terms to the left:
3x+45-(9x+51)=0
We get rid of parentheses
3x-9x-51+45=0
We add all the numbers together, and all the variables
-6x-6=0
We move all terms containing x to the left, all other terms to the right
-6x=6
x=6/-6
x=-1
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