209=-u+131

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Solution for 209=-u+131 equation: 



209=-u+131

We move all terms to the left:

209-(-u+131)=0

We add all the numbers together, and all the variables

-(-1u+131)+209=0

We get rid of parentheses

1u-131+209=0

We add all the numbers together, and all the variables

u+78=0

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

u=-78

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