400=-100x-100x

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Solution for 400=-100x-100x equation: 



400=-100x-100x

We move all terms to the left:

400-(-100x-100x)=0

We add all the numbers together, and all the variables

-(-200x)+400=0

We get rid of parentheses

200x+400=0

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

200x=-400

x=-400/200

x=-2

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