-1+8d=7d-9

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Solution for -1+8d=7d-9 equation: 



-1+8d=7d-9

We move all terms to the left:

-1+8d-(7d-9)=0

We get rid of parentheses

8d-7d+9-1=0

We add all the numbers together, and all the variables

d+8=0

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

d=-8

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