X+4y=-400

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Solution for X+4y=-400 equation: 



X+4X=-400

We move all terms to the left:

X+4X-(-400)=0

We add all the numbers together, and all the variables

5X+400=0

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

5X=-400

X=-400/5

X=-80

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