-13d-9d-(-d)+12d=18

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Solution for -13d-9d-(-d)+12d=18 equation: 



-13d-9d-(-d)+12d=18

We move all terms to the left:

-13d-9d-(-d)+12d-(18)=0

We add all the numbers together, and all the variables

-13d-9d-(-1d)+12d-18=0

We add all the numbers together, and all the variables

-10d-(-1d)-18=0

We get rid of parentheses

-10d+1d-18=0

We add all the numbers together, and all the variables

-9d-18=0

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

-9d=18

d=18/-9

d=-2

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