What value of m makes the equation 1
−10 =
4
−5 m true?

To find the value of "m", you need to isolate/get the variable "m" by itself in the equation:

1 - 10 = 4 - 5m      You can first combine 1 and -10

-9 = 4 - 5m       Subtract 4 on both sides

-9 - 4 = 4 - 4 - 5m

-13 = -5m      Divide -5 on both sides to get "m" by itself

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

PROOF

1 - 10 = 4 - 5m     Substitute/plug in into "m"

1 - 10 = 4 - 13

-9 = -9

simple 80 pieces in 1 sercing so 80*47=3760+20=3780