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3.9=x+1.6
We move all terms to the left:
3.9-(x+1.6)=0
We get rid of parentheses
-x-1.6+3.9=0
We add all the numbers together, and all the variables
-1x+2.3=0
We move all terms containing x to the left, all other terms to the right
-x=-2.3
x=-2.3/-1
x=2+0.3/1
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