.15-.2d=.3(d+3)

Solution for .15-.2d=.3(d+3) equation:

Simplifying
0.15 + -0.2d = 0.3(d + 3)

Reorder the terms:
0.15 + -0.2d = 0.3(3 + d)
0.15 + -0.2d = (3 * 0.3 + d * 0.3)
0.15 + -0.2d = (0.9 + 0.3d)

Solving
0.15 + -0.2d = 0.9 + 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.
0.15 + -0.2d + -0.3d = 0.9 + 0.3d + -0.3d

Combine like terms: -0.2d + -0.3d = -0.5d
0.15 + -0.5d = 0.9 + 0.3d + -0.3d

Combine like terms: 0.3d + -0.3d = 0.0
0.15 + -0.5d = 0.9 + 0.0
0.15 + -0.5d = 0.9

Add '-0.15' to each side of the equation.
0.15 + -0.15 + -0.5d = 0.9 + -0.15

Combine like terms: 0.15 + -0.15 = 0.00
0.00 + -0.5d = 0.9 + -0.15
-0.5d = 0.9 + -0.15

Combine like terms: 0.9 + -0.15 = 0.75
-0.5d = 0.75

Divide each side by '-0.5'.
d = -1.5

Simplifying
d = -1.5