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5.3-2.8x-7.1=3.9
We move all terms to the left:
5.3-2.8x-7.1-(3.9)=0
We add all the numbers together, and all the variables
-2.8x-5.7=0
We move all terms containing x to the left, all other terms to the right
-2.8x=5.7
x=5.7/-2.8
x=-2+0.1/2.8
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