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-3.1x+3=7.8
We move all terms to the left:
-3.1x+3-(7.8)=0
We add all the numbers together, and all the variables
-3.1x-4.8=0
We move all terms containing x to the left, all other terms to the right
-3.1x=4.8
x=4.8/-3.1
x=-1+1/1.8235294117647
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