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20.5=x+5
We move all terms to the left:
20.5-(x+5)=0
We get rid of parentheses
-x-5+20.5=0
We add all the numbers together, and all the variables
-1x+15.5=0
We move all terms containing x to the left, all other terms to the right
-x=-15.5
x=-15.5/-1
x=15+0.5/1
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