-20=-6+u/2

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Solution for -20=-6+u/2 equation: 



-20=-6+u/2

We move all terms to the left:

-20-(-6+u/2)=0

We add all the numbers together, and all the variables

-(u/2-6)-20=0

We get rid of parentheses

-u/2+6-20=0

We multiply all the terms by the denominator


-u+6*2-20*2=0

We add all the numbers together, and all the variables

-1u-28=0

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

-u=28

u=28/-1

u=-28

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