90=7d-1

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Solution for 90=7d-1 equation:


Simplifying
90 = 7d + -1

Reorder the terms:
90 = -1 + 7d

Solving
90 = -1 + 7d

Solving for variable 'd'.

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

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

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

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

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

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

Divide each side by '-7'.
d = 13

Simplifying
d = 13

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