6.9+12+(-4.91p)=-13+6.9-5.11p
6.9 + 12 – 4.91p = – 13 + 6.9 – 5.11p
– 4,91p + 5,11p = 6,9 – 13 – 12 – 6,9
0.2p = -25
p = -125
6.9+12+(-4.91p)=-13+6.9-5.11p
6.9 + 12 – 4.91p = – 13 + 6.9 – 5.11p
– 4,91p + 5,11p = 6,9 – 13 – 12 – 6,9
0.2p = -25
p = -125