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-3.1x=-12.4
We move all terms to the left:
-3.1x-(-12.4)=0
We add all the numbers together, and all the variables
-3.1x+12.4=0
We move all terms containing x to the left, all other terms to the right
-3.1x=-12.4
x=-12.4/-3.1
x=+4
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