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13.9=2.5x
We move all terms to the left:
13.9-(2.5x)=0
We add all the numbers together, and all the variables
-(+2.5x)+13.9=0
We get rid of parentheses
-2.5x+13.9=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-13.9
x=-13.9/-2.5
x=5+1/1.7857142857143
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