-12=3(u-7)-6u

Solution for -12=3(u-7)-6u equation:

-12=3(u-7)-6u

We move all terms to the left:

-12-(3(u-7)-6u)=0


We calculate terms in parentheses: -(3(u-7)-6u), so:

3(u-7)-6u

We add all the numbers together, and all the variables

-6u+3(u-7)

We multiply parentheses

-6u+3u-21

We add all the numbers together, and all the variables

-3u-21

Back to the equation:

-(-3u-21)


We get rid of parentheses

3u+21-12=0

We add all the numbers together, and all the variables

3u+9=0

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

3u=-9

u=-9/3

u=-3