342 × -0.05 - (-16.9) + (-93.1)

= -17.1 - (-16.9) + (-93.1)

= -17.1 + 16.9 - 93.1

= -17.2 - 93.1

= -110.3

Therefore, the result of the expression 342 × -0.05 - (-16.9) + (-93.1) is -110.3.