7(d+3)=21

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Solution for 7(d+3)=21 equation: 



7(d+3)=21

We move all terms to the left:

7(d+3)-(21)=0

We multiply parentheses

7d+21-21=0

We add all the numbers together, and all the variables

7d=0

d=0/7

d=0

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