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3.5=x-8
We move all terms to the left:
3.5-(x-8)=0
We get rid of parentheses
-x+8+3.5=0
We add all the numbers together, and all the variables
-1x+11.5=0
We move all terms containing x to the left, all other terms to the right
-x=-11.5
x=-11.5/-1
x=11+0.5/1
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