15=-8+d

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Solution for 15=-8+d equation: 



15=-8+d

We move all terms to the left:

15-(-8+d)=0

We add all the numbers together, and all the variables

-(d-8)+15=0

We get rid of parentheses

-d+8+15=0

We add all the numbers together, and all the variables

-1d+23=0

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

-d=-23

d=-23/-1

d=+23

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