9=-d+20

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Solution for 9=-d+20 equation: 



9=-d+20

We move all terms to the left:

9-(-d+20)=0

We add all the numbers together, and all the variables

-(-1d+20)+9=0

We get rid of parentheses

1d-20+9=0

We add all the numbers together, and all the variables

d-11=0

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

d=11

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