0.62 + (3.9 - 12.04 + 0.5) - (-0.62 - 12.04 + 7.2)
0.62 + (-8.14 + 0.5) - (-4.46)
0.62 - 7.64 + 4.46
-6.02 + 4.46
-1.56

Therefore, 0.62 + (3.9 - 12.04 + 0.5) - (-0.62 - 12.04 + 7.2) equals -1.56.