Use the distributive property.
1/7(105 + r) = 20
15 + (1/7)r = 20
Then subtract each side of the equation by 15.
15 + (1/7)r = 20
(1/7)r = 5
Divide both sides by 1/7.
(1/7)r = 5
r = 35
So, the answer to this question is r is equal to 35.
If you mean that you want to solve the equation for v, then all you need to do is to multiply both sides by 3:

Answer:
Step-by-step explanation:
Circumference = 2πr
Let's set the equation equal to the formula:
16 = 2πr
16/2 = πr
8 = πr
r = 8/π
3x-10>4+7x-3
3x-10>1+7x
-4x-10>1
-4x>11
x<-11/4
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Answer:
54 is the sum of 11 and Raj's age. Use variable "r" to represent Raj's age