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2.5+2.25x=9.25
We move all terms to the left:
2.5+2.25x-(9.25)=0
We add all the numbers together, and all the variables
2.25x-6.75=0
We move all terms containing x to the left, all other terms to the right
2.25x=6.75
x=6.75/2.25
x=3
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