6+9+d=3d

Solution for 6+9+d=3d equation:

Simplifying
6 + 9 + d = 3d

Combine like terms: 6 + 9 = 15
15 + d = 3d

Solving
15 + d = 3d

Solving for variable 'd'.

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

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

Combine like terms: d + -3d = -2d
15 + -2d = 3d + -3d

Combine like terms: 3d + -3d = 0
15 + -2d = 0

Add '-15' to each side of the equation.
15 + -15 + -2d = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -2d = 0 + -15
-2d = 0 + -15

Combine like terms: 0 + -15 = -15
-2d = -15

Divide each side by '-2'.
d = 7.5

Simplifying
d = 7.5