9.7+11+(-6.09r)=-6+9.7-6.49r
9.7 + 11 – 6.09r = – 6 + 9.7 – 6.49r
– 6,09r + 6,49r = 9,7 – 6 – 11 – 9,7
0.4r = -17
r = -42.5
9.7+11+(-6.09r)=-6+9.7-6.49r
9.7 + 11 – 6.09r = – 6 + 9.7 – 6.49r
– 6,09r + 6,49r = 9,7 – 6 – 11 – 9,7
0.4r = -17
r = -42.5