d+9=-d-9

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Solution for d+9=-d-9 equation: 



d+9=-d-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

d+1d+9+9=0

We add all the numbers together, and all the variables

2d+18=0

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

2d=-18

d=-18/2

d=-9

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