0.4(8-2w)=-4

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Solution for 0.4(8-2w)=-4 equation: 


Simplifying
0.4(8 + -2w) = -4
(8 * 0.4 + -2w * 0.4) = -4
(3.2 + -0.8w) = -4

Solving
3.2 + -0.8w = -4

Solving for variable 'w'.

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

Add '-3.2' to each side of the equation.
3.2 + -3.2 + -0.8w = -4 + -3.2

Combine like terms: 3.2 + -3.2 = 0.0
0.0 + -0.8w = -4 + -3.2
-0.8w = -4 + -3.2

Combine like terms: -4 + -3.2 = -7.2
-0.8w = -7.2

Divide each side by '-0.8'.
w = 9

Simplifying
w = 9

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