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-6=-2.1+x
We move all terms to the left:
-6-(-2.1+x)=0
We add all the numbers together, and all the variables
-(x-2.1)-6=0
We get rid of parentheses
-x+2.1-6=0
We add all the numbers together, and all the variables
-1x-3.9=0
We move all terms containing x to the left, all other terms to the right
-x=3.9
x=3.9/-1
x=-3+0.9/1
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