4d+1=2d+21

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Solution for 4d+1=2d+21 equation: 



4d+1=2d+21

We move all terms to the left:

4d+1-(2d+21)=0

We get rid of parentheses

4d-2d-21+1=0

We add all the numbers together, and all the variables

2d-20=0

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

2d=20

d=20/2

d=10

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