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-0.8x+4.1=6.2
We move all terms to the left:
-0.8x+4.1-(6.2)=0
We add all the numbers together, and all the variables
-0.8x-2.1=0
We move all terms containing x to the left, all other terms to the right
-0.8x=2.1
x=2.1/-0.8
x=-2+0.5/0.8
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