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15=x+3.4
We move all terms to the left:
15-(x+3.4)=0
We get rid of parentheses
-x-3.4+15=0
We add all the numbers together, and all the variables
-1x+11.6=0
We move all terms containing x to the left, all other terms to the right
-x=-11.6
x=-11.6/-1
x=11+0.6/1
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