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-12=x-5/2.1
We move all terms to the left:
-12-(x-5/2.1)=0
We add all the numbers together, and all the variables
-(+x-5/2.1)-12=0
We get rid of parentheses
-x-12+5/2.1=0
We multiply all the terms by the denominator
-x*2.1+5-12*2.1=0
We add all the numbers together, and all the variables
-x*2.1-20.2=0
Wy multiply elements
-2.1x-20.2=0
We move all terms containing x to the left, all other terms to the right
-2.1x=20.2
x=20.2/-2.1
x=-9+1/1.61538461538
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