How do i solve -1=-3r +2r

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

-1 = -3r + 2r       Combine like terms(terms that have the same variable and power/exponent.)  The only like terms you can combine are -3r and 2r

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

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

1 = r   or   r = 1

idc

step-by-step explanation:

idk

i think the length is 12 and the width is 17