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-15.9=x-13.4
We move all terms to the left:
-15.9-(x-13.4)=0
We get rid of parentheses
-x+13.4-15.9=0
We add all the numbers together, and all the variables
-1x-2.5=0
We move all terms containing x to the left, all other terms to the right
-x=2.5
x=2.5/-1
x=-2+0.5/1
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