-7(1+3r)=12-2r

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Solution for -7(1+3r)=12-2r equation: 



-7(1+3r)=12-2r

We move all terms to the left:

-7(1+3r)-(12-2r)=0

We add all the numbers together, and all the variables

-7(3r+1)-(-2r+12)=0

We multiply parentheses

-21r-(-2r+12)-7=0

We get rid of parentheses

-21r+2r-12-7=0

We add all the numbers together, and all the variables

-19r-19=0

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

-19r=19

r=19/-19

r=-1

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