15.6=-3.9r

Solution for 15.6=-3.9r equation:

Simplifying
15.6 = -3.9r

Solving
15.6 = -3.9r

Solving for variable 'r'.

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

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

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

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

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

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

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

Simplifying
r = -4