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-3.9-2x=5.9
We move all terms to the left:
-3.9-2x-(5.9)=0
We add all the numbers together, and all the variables
-2x-9.8=0
We move all terms containing x to the left, all other terms to the right
-2x=9.8
x=9.8/-2
x=-4+1/1.1111111111111
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