13d+21=4d-69

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Solution for 13d+21=4d-69 equation:


Simplifying
13d + 21 = 4d + -69

Reorder the terms:
21 + 13d = 4d + -69

Reorder the terms:
21 + 13d = -69 + 4d

Solving
21 + 13d = -69 + 4d

Solving for variable 'd'.

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

Add '-4d' to each side of the equation.
21 + 13d + -4d = -69 + 4d + -4d

Combine like terms: 13d + -4d = 9d
21 + 9d = -69 + 4d + -4d

Combine like terms: 4d + -4d = 0
21 + 9d = -69 + 0
21 + 9d = -69

Add '-21' to each side of the equation.
21 + -21 + 9d = -69 + -21

Combine like terms: 21 + -21 = 0
0 + 9d = -69 + -21
9d = -69 + -21

Combine like terms: -69 + -21 = -90
9d = -90

Divide each side by '9'.
d = -10

Simplifying
d = -10

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