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7.75x-3.5=2.5x+8.5
We move all terms to the left:
7.75x-3.5-(2.5x+8.5)=0
We get rid of parentheses
7.75x-2.5x-8.5-3.5=0
We add all the numbers together, and all the variables
5.25x-12=0
We move all terms containing x to the left, all other terms to the right
5.25x=12
x=12/5.25
x=2+1/3.5
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