d+0.21d=1.21

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Solution for d+0.21d=1.21 equation: 



d+0.21d=1.21

We move all terms to the left:

d+0.21d-(1.21)=0

We add all the numbers together, and all the variables

1.21d-1.21=0

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

1.21d=1.21

d=1.21/1.21

d=1

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