-2(6r+4)=21-9r

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Solution for -2(6r+4)=21-9r equation: 



-2(6r+4)=21-9r

We move all terms to the left:

-2(6r+4)-(21-9r)=0

We add all the numbers together, and all the variables

-2(6r+4)-(-9r+21)=0

We multiply parentheses

-12r-(-9r+21)-8=0

We get rid of parentheses

-12r+9r-21-8=0

We add all the numbers together, and all the variables

-3r-29=0

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

-3r=29

r=29/-3

r=-9+2/3

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