81=7d+4

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Solution for 81=7d+4 equation: 



81=7d+4

We move all terms to the left:

81-(7d+4)=0

We get rid of parentheses

-7d-4+81=0

We add all the numbers together, and all the variables

-7d+77=0

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

-7d=-77

d=-77/-7

d=+11

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