-9(9+d)=18

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Solution for -9(9+d)=18 equation: 



-9(9+d)=18

We move all terms to the left:

-9(9+d)-(18)=0

We add all the numbers together, and all the variables

-9(d+9)-18=0

We multiply parentheses

-9d-81-18=0

We add all the numbers together, and all the variables

-9d-99=0

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

-9d=99

d=99/-9

d=-11

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