-1=-d+(-13)

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Solution for -1=-d+(-13) equation: 



-1=-d+(-13)

We move all terms to the left:

-1-(-d+(-13))=0



We calculate terms in parentheses: -(-d+(-13)), so:

-d+(-13)

We add all the numbers together, and all the variables

-1d-13

Back to the equation:

-(-1d-13)



We get rid of parentheses

1d+13-1=0

We add all the numbers together, and all the variables

d+12=0

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

d=-12

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