7(d+3)=12(d-7)

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Solution for 7(d+3)=12(d-7) equation: 



7(d+3)=12(d-7)

We move all terms to the left:

7(d+3)-(12(d-7))=0

We multiply parentheses

7d-(12(d-7))+21=0



We calculate terms in parentheses: -(12(d-7)), so:

12(d-7)

We multiply parentheses

12d-84

Back to the equation:

-(12d-84)



We get rid of parentheses

7d-12d+84+21=0

We add all the numbers together, and all the variables

-5d+105=0

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

-5d=-105

d=-105/-5

d=+21

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