D+6=-2(d-6)

Solution for D+6=-2(d-6) equation:

Simplifying
D + 6 = -2(d + -6)

Reorder the terms:
6 + D = -2(d + -6)

Reorder the terms:
6 + D = -2(-6 + d)
6 + D = (-6 * -2 + d * -2)
6 + D = (12 + -2d)

Solving
6 + D = 12 + -2d

Solving for variable 'D'.

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

Add '-6' to each side of the equation.
6 + -6 + D = 12 + -6 + -2d

Combine like terms: 6 + -6 = 0
0 + D = 12 + -6 + -2d
D = 12 + -6 + -2d

Combine like terms: 12 + -6 = 6
D = 6 + -2d

Simplifying
D = 6 + -2d