0.4(2s+4)=-30

Solution for 0.4(2s+4)=-30 equation:

Simplifying
0.4(2s + 4) = -30

Reorder the terms:
0.4(4 + 2s) = -30
(4 * 0.4 + 2s * 0.4) = -30
(1.6 + 0.8s) = -30

Solving
1.6 + 0.8s = -30

Solving for variable 's'.

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

Add '-1.6' to each side of the equation.
1.6 + -1.6 + 0.8s = -30 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + 0.8s = -30 + -1.6
0.8s = -30 + -1.6

Combine like terms: -30 + -1.6 = -31.6
0.8s = -31.6

Divide each side by '0.8'.
s = -39.5

Simplifying
s = -39.5