Respuesta :

Answer:

-24

Step-by-step explanation:

first multiply -3 and 5 to get -15

so it will be 12-21-15 then subtract 12-21 and you get -9

then do -9-15=24  

hope this helps :)
Follow the rule pemdas

So for this multiplication goes first (3x5) = 15

Then we are left with (12-21-15)*left to right*

So (12-21) =-9

Finally we are left with (-9-15) = -24

The answer is -24