31=d+30

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Solution for 31=d+30 equation: 



31=d+30

We move all terms to the left:

31-(d+30)=0

We get rid of parentheses

-d-30+31=0

We add all the numbers together, and all the variables

-1d+1=0

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

-d=-1

d=-1/-1

d=1

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