-0.6=-0.3(d+6)

Solution for -0.6=-0.3(d+6) equation:

Simplifying
-0.6 = -0.3(d + 6)

Reorder the terms:
-0.6 = -0.3(6 + d)
-0.6 = (6 * -0.3 + d * -0.3)
-0.6 = (-1.8 + -0.3d)

Solving
-0.6 = -1.8 + -0.3d

Solving for variable 'd'.

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

Add '0.3d' to each side of the equation.
-0.6 + 0.3d = -1.8 + -0.3d + 0.3d

Combine like terms: -0.3d + 0.3d = 0.0
-0.6 + 0.3d = -1.8 + 0.0
-0.6 + 0.3d = -1.8

Add '0.6' to each side of the equation.
-0.6 + 0.6 + 0.3d = -1.8 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 0.3d = -1.8 + 0.6
0.3d = -1.8 + 0.6

Combine like terms: -1.8 + 0.6 = -1.2
0.3d = -1.2

Divide each side by '0.3'.
d = -4

Simplifying
d = -4