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6.8x-12.3=8.1
We move all terms to the left:
6.8x-12.3-(8.1)=0
We add all the numbers together, and all the variables
6.8x-20.4=0
We move all terms containing x to the left, all other terms to the right
6.8x=20.4
x=20.4/6.8
x=3
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