Hey there! :D
Distribute the -6. Multiply everything by -6.
-6*14x= -84x
-6*-23x= 138x
-6*56= -336x
We now have: 138x-84x-336x
138x- 420x
-282x <== that is the answer
I'm assuming that is B, since there seems to be missing information.
I hope this helps!
~kaikers