10+u=-u

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Solution for 10+u=-u equation: 



10+u=-u

We move all terms to the left:

10+u-(-u)=0

We add all the numbers together, and all the variables

u-(-1u)+10=0

We get rid of parentheses

u+1u+10=0

We add all the numbers together, and all the variables

2u+10=0

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

2u=-10

u=-10/2

u=-5

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