9d-1=2d+20

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Solution for 9d-1=2d+20 equation:


Simplifying
9d + -1 = 2d + 20

Reorder the terms:
-1 + 9d = 2d + 20

Reorder the terms:
-1 + 9d = 20 + 2d

Solving
-1 + 9d = 20 + 2d

Solving for variable 'd'.

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

Add '-2d' to each side of the equation.
-1 + 9d + -2d = 20 + 2d + -2d

Combine like terms: 9d + -2d = 7d
-1 + 7d = 20 + 2d + -2d

Combine like terms: 2d + -2d = 0
-1 + 7d = 20 + 0
-1 + 7d = 20

Add '1' to each side of the equation.
-1 + 1 + 7d = 20 + 1

Combine like terms: -1 + 1 = 0
0 + 7d = 20 + 1
7d = 20 + 1

Combine like terms: 20 + 1 = 21
7d = 21

Divide each side by '7'.
d = 3

Simplifying
d = 3

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