X+40=8-x

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Solution for X+40=8-x equation: 



X+40=8-X

We move all terms to the left:

X+40-(8-X)=0

We add all the numbers together, and all the variables

X-(-1X+8)+40=0

We get rid of parentheses

X+1X-8+40=0

We add all the numbers together, and all the variables

2X+32=0

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

2X=-32

X=-32/2

X=-16

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