-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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