21.2=d+12.2

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Solution for 21.2=d+12.2 equation: 



21.2=d+12.2

We move all terms to the left:

21.2-(d+12.2)=0

We get rid of parentheses

-d-12.2+21.2=0

We add all the numbers together, and all the variables

-1d+9=0

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

-d=-9

d=-9/-1

d=+9

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