.9w-.8w+.4w=3

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Solution for .9w-.8w+.4w=3 equation: 


Simplifying
0.9w + -0.8w + 0.4w = 3

Combine like terms: 0.9w + -0.8w = 0.1w
0.1w + 0.4w = 3

Combine like terms: 0.1w + 0.4w = 0.5w
0.5w = 3

Solving
0.5w = 3

Solving for variable 'w'.

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

Divide each side by '0.5'.
w = 6

Simplifying
w = 6

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