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77.1-x=-48.2
We move all terms to the left:
77.1-x-(-48.2)=0
We add all the numbers together, and all the variables
-1x+125.3=0
We move all terms containing x to the left, all other terms to the right
-x=-125.3
x=-125.3/-1
x=125+0.3/1
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