-21+10d=7

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Solution for -21+10d=7 equation: 



-21+10d=7

We move all terms to the left:

-21+10d-(7)=0

We add all the numbers together, and all the variables

10d-28=0

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

10d=28

d=28/10

d=2+4/5

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