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5.2x-12.3=8.5
We move all terms to the left:
5.2x-12.3-(8.5)=0
We add all the numbers together, and all the variables
5.2x-20.8=0
We move all terms containing x to the left, all other terms to the right
5.2x=20.8
x=20.8/5.2
x=4
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