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4.2x-16.4=-3.8
We move all terms to the left:
4.2x-16.4-(-3.8)=0
We add all the numbers together, and all the variables
4.2x-12.6=0
We move all terms containing x to the left, all other terms to the right
4.2x=12.6
x=12.6/4.2
x=3+-1.7763568394003E-15/4.2
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