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12000=2.75x+0.35x
We move all terms to the left:
12000-(2.75x+0.35x)=0
We add all the numbers together, and all the variables
-(+3.1x)+12000=0
We get rid of parentheses
-3.1x+12000=0
We move all terms containing x to the left, all other terms to the right
-3.1x=-12000
x=-12000/-3.1
x=3870+1/1.0333333333333
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