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13.7=x+5.5
We move all terms to the left:
13.7-(x+5.5)=0
We get rid of parentheses
-x-5.5+13.7=0
We add all the numbers together, and all the variables
-1x+8.2=0
We move all terms containing x to the left, all other terms to the right
-x=-8.2
x=-8.2/-1
x=8+0.2/1
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