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2.1x-5.8=6.8
We move all terms to the left:
2.1x-5.8-(6.8)=0
We add all the numbers together, and all the variables
2.1x-12.6=0
We move all terms containing x to the left, all other terms to the right
2.1x=12.6
x=12.6/2.1
x=6+-1.7763568394003E-15/2.1
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