4=-0.4x

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Solution for 4=-0.4x equation: 



4=-0.4x

We move all terms to the left:

4-(-0.4x)=0

We get rid of parentheses

0.4x+4=0

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

0.4x=-4

x=-4/0.4

x=-10

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