Respuesta :
r in (-oo:+oo)
r/2-6 = 14 // - 14
r/2-14-6 = 0
1/2*r-20 = 0 // + 20
1/2*r = 20 // : 1/2
r = 20/1/2
r = 40
r = 40
r/2-6 = 14 // - 14
r/2-14-6 = 0
1/2*r-20 = 0 // + 20
1/2*r = 20 // : 1/2
r = 20/1/2
r = 40
r = 40