5s+3(5s+2)=-81

Solution for 5s+3(5s+2)=-81 equation:

Simplifying
5s + 3(5s + 2) = -81

Reorder the terms:
5s + 3(2 + 5s) = -81
5s + (2 * 3 + 5s * 3) = -81
5s + (6 + 15s) = -81

Reorder the terms:
6 + 5s + 15s = -81

Combine like terms: 5s + 15s = 20s
6 + 20s = -81

Solving
6 + 20s = -81

Solving for variable 's'.

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

Add '-6' to each side of the equation.
6 + -6 + 20s = -81 + -6

Combine like terms: 6 + -6 = 0
0 + 20s = -81 + -6
20s = -81 + -6

Combine like terms: -81 + -6 = -87
20s = -87

Divide each side by '20'.
s = -4.35

Simplifying
s = -4.35