-12=6+18-9u

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Solution for -12=6+18-9u equation: 



-12=6+18-9u

We move all terms to the left:

-12-(6+18-9u)=0

We add all the numbers together, and all the variables

-(-9u+24)-12=0

We get rid of parentheses

9u-24-12=0

We add all the numbers together, and all the variables

9u-36=0

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

9u=36

u=36/9

u=4

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