d+(-9)=21

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Solution for d+(-9)=21 equation: 



d+(-9)=21

We move all terms to the left:

d+(-9)-(21)=0

determiningTheFunctionDomain
d-21+(-9)=0

We add all the numbers together, and all the variables

d-30=0

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

d=30

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