7=10(3d+8)+9

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Solution for 7=10(3d+8)+9 equation: 



7=10(3d+8)+9

We move all terms to the left:

7-(10(3d+8)+9)=0



We calculate terms in parentheses: -(10(3d+8)+9), so:

10(3d+8)+9

We multiply parentheses

30d+80+9

We add all the numbers together, and all the variables

30d+89

Back to the equation:

-(30d+89)



We get rid of parentheses

-30d-89+7=0

We add all the numbers together, and all the variables

-30d-82=0

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

-30d=82

d=82/-30

d=-2+11/15

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