4=2.1+d

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Solution for 4=2.1+d equation: 



4=2.1+d

We move all terms to the left:

4-(2.1+d)=0

We add all the numbers together, and all the variables

-(d+2.1)+4=0

We get rid of parentheses

-d-2.1+4=0

We add all the numbers together, and all the variables

-1d+1.9=0

We move all terms containing d to the left, all other terms to the right

-d=-1.9

d=-1.9/-1

d=1+0.9/1

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