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2.8x+5=13.4
We move all terms to the left:
2.8x+5-(13.4)=0
We add all the numbers together, and all the variables
2.8x-8.4=0
We move all terms containing x to the left, all other terms to the right
2.8x=8.4
x=8.4/2.8
x=3+1.7763568394003E-15/2.8
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