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5x-3.1=7.8
We move all terms to the left:
5x-3.1-(7.8)=0
We add all the numbers together, and all the variables
5x-10.9=0
We move all terms containing x to the left, all other terms to the right
5x=10.9
x=10.9/5
x=2+0.9/5
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