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3.5=x+5
We move all terms to the left:
3.5-(x+5)=0
We get rid of parentheses
-x-5+3.5=0
We add all the numbers together, and all the variables
-1x-1.5=0
We move all terms containing x to the left, all other terms to the right
-x=1.5
x=1.5/-1
x=-1+0.5/1
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