13+9=9d+21

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Solution for 13+9=9d+21 equation:


Simplifying
13 + 9 = 9d + 21

Combine like terms: 13 + 9 = 22
22 = 9d + 21

Reorder the terms:
22 = 21 + 9d

Solving
22 = 21 + 9d

Solving for variable 'd'.

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

Add '-9d' to each side of the equation.
22 + -9d = 21 + 9d + -9d

Combine like terms: 9d + -9d = 0
22 + -9d = 21 + 0
22 + -9d = 21

Add '-22' to each side of the equation.
22 + -22 + -9d = 21 + -22

Combine like terms: 22 + -22 = 0
0 + -9d = 21 + -22
-9d = 21 + -22

Combine like terms: 21 + -22 = -1
-9d = -1

Divide each side by '-9'.
d = 0.1111111111

Simplifying
d = 0.1111111111

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