3=3(d+7)-7d

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



3=3(d+7)-7d

We move all terms to the left:

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



We calculate terms in parentheses: -(3(d+7)-7d), so:

3(d+7)-7d

We add all the numbers together, and all the variables

-7d+3(d+7)

We multiply parentheses

-7d+3d+21

We add all the numbers together, and all the variables

-4d+21

Back to the equation:

-(-4d+21)



We get rid of parentheses

4d-21+3=0

We add all the numbers together, and all the variables

4d-18=0

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

4d=18

d=18/4

d=4+1/2

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