-31=2d-13

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Solution for -31=2d-13 equation: 



-31=2d-13

We move all terms to the left:

-31-(2d-13)=0

We get rid of parentheses

-2d+13-31=0

We add all the numbers together, and all the variables

-2d-18=0

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

-2d=18

d=18/-2

d=-9

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