7(d-1)=56

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Solution for 7(d-1)=56 equation: 



7(d-1)=56

We move all terms to the left:

7(d-1)-(56)=0

We multiply parentheses

7d-7-56=0

We add all the numbers together, and all the variables

7d-63=0

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

7d=63

d=63/7

d=9

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