0.7w-0.4w+0.2w=4

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Solution for 0.7w-0.4w+0.2w=4 equation: 


Simplifying
0.7w + -0.4w + 0.2w = 4

Combine like terms: 0.7w + -0.4w = 0.3w
0.3w + 0.2w = 4

Combine like terms: 0.3w + 0.2w = 0.5w
0.5w = 4

Solving
0.5w = 4

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 = 8

Simplifying
w = 8

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