50=21+d

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Solution for 50=21+d equation: 



50=21+d

We move all terms to the left:

50-(21+d)=0

We add all the numbers together, and all the variables

-(d+21)+50=0

We get rid of parentheses

-d-21+50=0

We add all the numbers together, and all the variables

-1d+29=0

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

-d=-29

d=-29/-1

d=+29

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