7(d+6)=420

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Solution for 7(d+6)=420 equation: 



7(d+6)=420

We move all terms to the left:

7(d+6)-(420)=0

We multiply parentheses

7d+42-420=0

We add all the numbers together, and all the variables

7d-378=0

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

7d=378

d=378/7

d=54

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