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15.5x+31=511.5
We move all terms to the left:
15.5x+31-(511.5)=0
We add all the numbers together, and all the variables
15.5x-480.5=0
We move all terms containing x to the left, all other terms to the right
15.5x=480.5
x=480.5/15.5
x=31
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