X+y=-21

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Solution for X+y=-21 equation: 



X+X=-21

We move all terms to the left:

X+X-(-21)=0

We add all the numbers together, and all the variables

2X+21=0

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

2X=-21

X=-21/2

X=-10+1/2

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