8+7d=-d

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Solution for 8+7d=-d equation: 



8+7d=-d

We move all terms to the left:

8+7d-(-d)=0

We add all the numbers together, and all the variables

7d-(-1d)+8=0

We get rid of parentheses

7d+1d+8=0

We add all the numbers together, and all the variables

8d+8=0

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

8d=-8

d=-8/8

d=-1

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