-2(9-r)=12

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Solution for -2(9-r)=12 equation: 



-2(9-r)=12

We move all terms to the left:

-2(9-r)-(12)=0

We add all the numbers together, and all the variables

-2(-1r+9)-12=0

We multiply parentheses

2r-18-12=0

We add all the numbers together, and all the variables

2r-30=0

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

2r=30

r=30/2

r=15

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