15.6=-3.9d

Solution for 15.6=-3.9d equation:

Simplifying
15.6 = -3.9d

Solving
15.6 = -3.9d

Solving for variable 'd'.

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

Add '3.9d' to each side of the equation.
15.6 + 3.9d = -3.9d + 3.9d

Combine like terms: -3.9d + 3.9d = 0.0
15.6 + 3.9d = 0.0

Add '-15.6' to each side of the equation.
15.6 + -15.6 + 3.9d = 0.0 + -15.6

Combine like terms: 15.6 + -15.6 = 0.0
0.0 + 3.9d = 0.0 + -15.6
3.9d = 0.0 + -15.6

Combine like terms: 0.0 + -15.6 = -15.6
3.9d = -15.6

Divide each side by '3.9'.
d = -4

Simplifying
d = -4