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5x-9=2.5x+x
We move all terms to the left:
5x-9-(2.5x+x)=0
We add all the numbers together, and all the variables
5x-(+3.5x)-9=0
We get rid of parentheses
5x-3.5x-9=0
We add all the numbers together, and all the variables
1.5x-9=0
We move all terms containing x to the left, all other terms to the right
1.5x=9
x=9/1.5
x=6
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