12d-9=15d+9

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Solution for 12d-9=15d+9 equation:


Simplifying
12d + -9 = 15d + 9

Reorder the terms:
-9 + 12d = 15d + 9

Reorder the terms:
-9 + 12d = 9 + 15d

Solving
-9 + 12d = 9 + 15d

Solving for variable 'd'.

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

Add '-15d' to each side of the equation.
-9 + 12d + -15d = 9 + 15d + -15d

Combine like terms: 12d + -15d = -3d
-9 + -3d = 9 + 15d + -15d

Combine like terms: 15d + -15d = 0
-9 + -3d = 9 + 0
-9 + -3d = 9

Add '9' to each side of the equation.
-9 + 9 + -3d = 9 + 9

Combine like terms: -9 + 9 = 0
0 + -3d = 9 + 9
-3d = 9 + 9

Combine like terms: 9 + 9 = 18
-3d = 18

Divide each side by '-3'.
d = -6

Simplifying
d = -6

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