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5x=9+15x
We move all terms to the left:
5x-(9+15x)=0
We add all the numbers together, and all the variables
5x-(15x+9)=0
We get rid of parentheses
5x-15x-9=0
We add all the numbers together, and all the variables
-10x-9=0
We move all terms containing x to the left, all other terms to the right
-10x=9
x=9/-10
x=-9/10
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