-21=9d-4d

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Solution for -21=9d-4d equation:


Simplifying
-21 = 9d + -4d

Combine like terms: 9d + -4d = 5d
-21 = 5d

Solving
-21 = 5d

Solving for variable 'd'.

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

Add '-5d' to each side of the equation.
-21 + -5d = 5d + -5d

Combine like terms: 5d + -5d = 0
-21 + -5d = 0

Add '21' to each side of the equation.
-21 + 21 + -5d = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -5d = 0 + 21
-5d = 0 + 21

Combine like terms: 0 + 21 = 21
-5d = 21

Divide each side by '-5'.
d = -4.2

Simplifying
d = -4.2

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