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8.1x-12.9=3.3
We move all terms to the left:
8.1x-12.9-(3.3)=0
We add all the numbers together, and all the variables
8.1x-16.2=0
We move all terms containing x to the left, all other terms to the right
8.1x=16.2
x=16.2/8.1
x=2
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