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-2x-12.8=20
We move all terms to the left:
-2x-12.8-(20)=0
We add all the numbers together, and all the variables
-2x-32.8=0
We move all terms containing x to the left, all other terms to the right
-2x=32.8
x=32.8/-2
x=-16+0.8/2
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