8d-21=12d-9

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Solution for 8d-21=12d-9 equation:


Simplifying
8d + -21 = 12d + -9

Reorder the terms:
-21 + 8d = 12d + -9

Reorder the terms:
-21 + 8d = -9 + 12d

Solving
-21 + 8d = -9 + 12d

Solving for variable 'd'.

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

Add '-12d' to each side of the equation.
-21 + 8d + -12d = -9 + 12d + -12d

Combine like terms: 8d + -12d = -4d
-21 + -4d = -9 + 12d + -12d

Combine like terms: 12d + -12d = 0
-21 + -4d = -9 + 0
-21 + -4d = -9

Add '21' to each side of the equation.
-21 + 21 + -4d = -9 + 21

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

Combine like terms: -9 + 21 = 12
-4d = 12

Divide each side by '-4'.
d = -3

Simplifying
d = -3

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