Tolong dijawab yaaahhh

Jawaban:

a-1/a+2=a-7/a-1

(a-1)(a-2)=(a+2) (a-7)

3a=15

a=-5

U1=a+2

=-5+2=-3

U2=a-1

=-5-1=6

R=u2/u1=-6/-3=2