-7(1+3r)=-91

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Solution for -7(1+3r)=-91 equation: 



-7(1+3r)=-91

We move all terms to the left:

-7(1+3r)-(-91)=0

We add all the numbers together, and all the variables

-7(3r+1)-(-91)=0

We add all the numbers together, and all the variables

-7(3r+1)+91=0

We multiply parentheses

-21r-7+91=0

We add all the numbers together, and all the variables

-21r+84=0

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

-21r=-84

r=-84/-21

r=+4

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