4.2=-0.4w

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Solution for 4.2=-0.4w equation: 



4.2=-0.4w

We move all terms to the left:

4.2-(-0.4w)=0

We get rid of parentheses

0.4w+4.2=0

We move all terms containing w to the left, all other terms to the right

0.4w=-4.2

w=-4.2/0.4

w=-10+0.2/0.4

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