(7d-1)=90

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Solution for (7d-1)=90 equation: 


Simplifying
(7d + -1) = 90

Reorder the terms:
(-1 + 7d) = 90

Remove parenthesis around (-1 + 7d)
-1 + 7d = 90

Solving
-1 + 7d = 90

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + 1 + 7d = 90 + 1

Combine like terms: -1 + 1 = 0
0 + 7d = 90 + 1
7d = 90 + 1

Combine like terms: 90 + 1 = 91
7d = 91

Divide each side by '7'.
d = 13

Simplifying
d = 13

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