12d-3=4d+21

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Solution for 12d-3=4d+21 equation:


Simplifying
12d + -3 = 4d + 21

Reorder the terms:
-3 + 12d = 4d + 21

Reorder the terms:
-3 + 12d = 21 + 4d

Solving
-3 + 12d = 21 + 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.
-3 + 12d + -4d = 21 + 4d + -4d

Combine like terms: 12d + -4d = 8d
-3 + 8d = 21 + 4d + -4d

Combine like terms: 4d + -4d = 0
-3 + 8d = 21 + 0
-3 + 8d = 21

Add '3' to each side of the equation.
-3 + 3 + 8d = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 8d = 21 + 3
8d = 21 + 3

Combine like terms: 21 + 3 = 24
8d = 24

Divide each side by '8'.
d = 3

Simplifying
d = 3

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