The answer to your question is 36
-5x-16=8
-5x=24



above is how to correctly solve the equation
The error is in step 3.
Step 3 as written: 
This is incorrect because you are removing the 5 from the -5x so it wouldn't be in the numerator.
Hope this helps
B
is the answer says so right there
42 x 1.07 = 44.94
44.94 - 2.94 = 42
58 x 1.07 = 62.06$