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1.3x+4.2=8.1
We move all terms to the left:
1.3x+4.2-(8.1)=0
We add all the numbers together, and all the variables
1.3x-3.9=0
We move all terms containing x to the left, all other terms to the right
1.3x=3.9
x=3.9/1.3
x=3+-4.4408920985006E-16/1.3
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