Answer:
6.4/-3.2=-3.2 is a required answer.
Answer:

Step-by-step explanation:

Let's eliminate the c. Take the second and subtract the first. Take the third and subtract the first.

Now take 3 times the first and subtract from the second.

Substitute back to calculate b.

Substitute back to calculate c.

Answer:
34
Step-by-step explanation:
40-12+3= 31
that should be your answer