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13=x+3.5
We move all terms to the left:
13-(x+3.5)=0
We get rid of parentheses
-x-3.5+13=0
We add all the numbers together, and all the variables
-1x+9.5=0
We move all terms containing x to the left, all other terms to the right
-x=-9.5
x=-9.5/-1
x=9+0.5/1
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