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20+3.5+8-4=x
We move all terms to the left:
20+3.5+8-4-(x)=0
We add all the numbers together, and all the variables
-1x+27.5=0
We move all terms containing x to the left, all other terms to the right
-x=-27.5
x=-27.5/-1
x=27+0.5/1
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