How do I do this?

-2(6-r)=4

To solve this, you need to isolate/get the variable "r" by itself in the equation:

-2(6 - r) = 4   Divide -2 on both sides

6 - r = -2    Subtract 6 on both sides

6 - 6 - r = -2 - 6

-r = -8       Divide -1 on both sides to get "r" by itself

    (two negative signs cancel each other out and become positive)

r = 8

PROOF

-2(6 - r) = 4    Substitute/plug in 8 into "r"

-2(6 - 8) = 4

-2(-2) = 4

4 = 4

127

whether it's diameter, or radius, i believe if i remember correctly from school, every amount has to always add up to 180. so if you take 53, and starting adding, long story short, taking 127 and adding it to 53, gives you 180.

step-by-step explanation: