0.4=-0.4(s-8)

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Solution for 0.4=-0.4(s-8) equation: 


Simplifying
0.4 = -0.4(s + -8)

Reorder the terms:
0.4 = -0.4(-8 + s)
0.4 = (-8 * -0.4 + s * -0.4)
0.4 = (3.2 + -0.4s)

Solving
0.4 = 3.2 + -0.4s

Solving for variable 's'.

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

Add '0.4s' to each side of the equation.
0.4 + 0.4s = 3.2 + -0.4s + 0.4s

Combine like terms: -0.4s + 0.4s = 0.0
0.4 + 0.4s = 3.2 + 0.0
0.4 + 0.4s = 3.2

Add '-0.4' to each side of the equation.
0.4 + -0.4 + 0.4s = 3.2 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + 0.4s = 3.2 + -0.4
0.4s = 3.2 + -0.4

Combine like terms: 3.2 + -0.4 = 2.8
0.4s = 2.8

Divide each side by '0.4'.
s = 7

Simplifying
s = 7

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