7.8+15+(-7.15p)=-9+7.8-7.65p
7.8 + 15 – 7.15p = – 9 + 7.8 – 7.65p
– 7,15p + 7,65p = 7,8 – 9 – 15 – 7,8
0.5p = -24
p = -48
7.8+15+(-7.15p)=-9+7.8-7.65p
7.8 + 15 – 7.15p = – 9 + 7.8 – 7.65p
– 7,15p + 7,65p = 7,8 – 9 – 15 – 7,8
0.5p = -24
p = -48