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13.2=x/2.1
We move all terms to the left:
13.2-(x/2.1)=0
We add all the numbers together, and all the variables
-(+x/2.1)+13.2=0
We get rid of parentheses
-x/2.1+13.2=0
We multiply all the terms by the denominator
-x+(13.2)*2.1=0
We add all the numbers together, and all the variables
-1x+27.72=0
We move all terms containing x to the left, all other terms to the right
-x=-27.72
x=-27.72/-1
x=27+0.72/1
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