7-7(3r+1)=84

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Solution for 7-7(3r+1)=84 equation: 



7-7(3r+1)=84

We move all terms to the left:

7-7(3r+1)-(84)=0

We add all the numbers together, and all the variables

-7(3r+1)-77=0

We multiply parentheses

-21r-7-77=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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