12-6(y-3)=3(-5-3y)+21

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Solution for 12-6(y-3)=3(-5-3y)+21 equation: 



12-6(y-3)=3(-5-3y)+21

We move all terms to the left:

12-6(y-3)-(3(-5-3y)+21)=0

We add all the numbers together, and all the variables

-6(y-3)-(3(-3y-5)+21)+12=0

We multiply parentheses

-6y-(3(-3y-5)+21)+18+12=0



We calculate terms in parentheses: -(3(-3y-5)+21), so:

3(-3y-5)+21

We multiply parentheses

-9y-15+21

We add all the numbers together, and all the variables

-9y+6

Back to the equation:

-(-9y+6)



We add all the numbers together, and all the variables

-6y-(-9y+6)+30=0

We get rid of parentheses

-6y+9y-6+30=0

We add all the numbers together, and all the variables

3y+24=0

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

3y=-24

y=-24/3

y=-8

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