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3.8x+2.1=13.5
We move all terms to the left:
3.8x+2.1-(13.5)=0
We add all the numbers together, and all the variables
3.8x-11.4=0
We move all terms containing x to the left, all other terms to the right
3.8x=11.4
x=11.4/3.8
x=3+1.7763568394E-15/3.8
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