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15x-45=9x-9
We move all terms to the left:
15x-45-(9x-9)=0
We get rid of parentheses
15x-9x+9-45=0
We add all the numbers together, and all the variables
6x-36=0
We move all terms containing x to the left, all other terms to the right
6x=36
x=36/6
x=6
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