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21.5-x=-53.3
We move all terms to the left:
21.5-x-(-53.3)=0
We add all the numbers together, and all the variables
-1x+74.8=0
We move all terms containing x to the left, all other terms to the right
-x=-74.8
x=-74.8/-1
x=74+0.8/1
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