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-25.9+54.8=x
We move all terms to the left:
-25.9+54.8-(x)=0
We add all the numbers together, and all the variables
-1x+28.9=0
We move all terms containing x to the left, all other terms to the right
-x=-28.9
x=-28.9/-1
x=28+0.9/1
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