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15.5=x+13.8
We move all terms to the left:
15.5-(x+13.8)=0
We get rid of parentheses
-x-13.8+15.5=0
We add all the numbers together, and all the variables
-1x+1.7=0
We move all terms containing x to the left, all other terms to the right
-x=-1.7
x=-1.7/-1
x=1+0.7/1
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