3r+9r+(12-2)=-2

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Solution for 3r+9r+(12-2)=-2 equation: 



3r+9r+(12-2)=-2

We move all terms to the left:

3r+9r+(12-2)-(-2)=0

We add all the numbers together, and all the variables

3r+9r+10-(-2)=0

We add all the numbers together, and all the variables

12r+12=0

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

12r=-12

r=-12/12

r=-1

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