-31d+22d-31d-(-21d)+30d=-33

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Solution for -31d+22d-31d-(-21d)+30d=-33 equation: 



-31d+22d-31d-(-21d)+30d=-33

We move all terms to the left:

-31d+22d-31d-(-21d)+30d-(-33)=0

We add all the numbers together, and all the variables

-10d-(-21d)+33=0

We get rid of parentheses

-10d+21d+33=0

We add all the numbers together, and all the variables

11d+33=0

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

11d=-33

d=-33/11

d=-3

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