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42.8-x=-10.7
We move all terms to the left:
42.8-x-(-10.7)=0
We add all the numbers together, and all the variables
-1x+53.5=0
We move all terms containing x to the left, all other terms to the right
-x=-53.5
x=-53.5/-1
x=53+0.5/1
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