105=(d-21)

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Solution for 105=(d-21) equation: 



105=(d-21)

We move all terms to the left:

105-((d-21))=0



We calculate terms in parentheses: -((d-21)), so:

(d-21)

We get rid of parentheses

d-21

Back to the equation:

-(d-21)



We get rid of parentheses

-d+21+105=0

We add all the numbers together, and all the variables

-1d+126=0

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

-d=-126

d=-126/-1

d=+126

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