9x+400=-x

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Solution for 9x+400=-x equation:



9x+400=-x
We move all terms to the left:
9x+400-(-x)=0
We add all the numbers together, and all the variables
9x-(-1x)+400=0
We get rid of parentheses
9x+1x+400=0
We add all the numbers together, and all the variables
10x+400=0
We move all terms containing x to the left, all other terms to the right
10x=-400
x=-400/10
x=-40

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