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-3x-8.1=4x+5.9
We move all terms to the left:
-3x-8.1-(4x+5.9)=0
We get rid of parentheses
-3x-4x-5.9-8.1=0
We add all the numbers together, and all the variables
-7x-14=0
We move all terms containing x to the left, all other terms to the right
-7x=14
x=14/-7
x=-2
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