Answer:
-16
Explanation:
• 12a - 2b - 4b - 15a + 2 (a = 0, b = 3) 
→ apply the values
• 12x0 - 2x3 - 4x3 - 15x0 + 2 
• 0 - 6 -12 - 0 + 2 
→ use BODMAS formulae 
• 0 - 6 - 12 - 2 
= 0 - 6 - 10 
→ zero wouldn't be counted so
 - 6 - 10
 (-) + (-) = (+) so: 
= -16