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5.1x-3.1=7.1
We move all terms to the left:
5.1x-3.1-(7.1)=0
We add all the numbers together, and all the variables
5.1x-10.2=0
We move all terms containing x to the left, all other terms to the right
5.1x=10.2
x=10.2/5.1
x=2
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