.15-.2d=30(d+3)

Solution for .15-.2d=30(d+3) equation:

Simplifying
0.15 + -0.2d = 30(d + 3)

Reorder the terms:
0.15 + -0.2d = 30(3 + d)
0.15 + -0.2d = (3 * 30 + d * 30)
0.15 + -0.2d = (90 + 30d)

Solving
0.15 + -0.2d = 90 + 30d

Solving for variable 'd'.

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

Add '-30d' to each side of the equation.
0.15 + -0.2d + -30d = 90 + 30d + -30d

Combine like terms: -0.2d + -30d = -30.2d
0.15 + -30.2d = 90 + 30d + -30d

Combine like terms: 30d + -30d = 0
0.15 + -30.2d = 90 + 0
0.15 + -30.2d = 90

Add '-0.15' to each side of the equation.
0.15 + -0.15 + -30.2d = 90 + -0.15

Combine like terms: 0.15 + -0.15 = 0.00
0.00 + -30.2d = 90 + -0.15
-30.2d = 90 + -0.15

Combine like terms: 90 + -0.15 = 89.85
-30.2d = 89.85

Divide each side by '-30.2'.
d = -2.975165563

Simplifying
d = -2.975165563