-2=9-d/7-8

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Solution for -2=9-d/7-8 equation: 



-2=9-d/7-8

We move all terms to the left:

-2-(9-d/7-8)=0

We add all the numbers together, and all the variables

-(-d/7+1)-2=0

We get rid of parentheses

d/7-1-2=0

We multiply all the terms by the denominator


d-1*7-2*7=0

We add all the numbers together, and all the variables

d-21=0

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

d=21

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