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-3.1+x/4=-15.9
We move all terms to the left:
-3.1+x/4-(-15.9)=0
We add all the numbers together, and all the variables
x/4+12.8=0
We multiply all the terms by the denominator
x+(12.8)*4=0
We add all the numbers together, and all the variables
x+51.2=0
We move all terms containing x to the left, all other terms to the right
x=-51.2
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