-2d=-42

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Solution for -2d=-42 equation: 



-2d=-42

We move all terms to the left:

-2d-(-42)=0

We add all the numbers together, and all the variables

-2d+42=0

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

-2d=-42

d=-42/-2

d=+21

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