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2.5x+3.5=31
We move all terms to the left:
2.5x+3.5-(31)=0
We add all the numbers together, and all the variables
2.5x-27.5=0
We move all terms containing x to the left, all other terms to the right
2.5x=27.5
x=27.5/2.5
x=11
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