Question #39c1b

2 Answers
Oct 3, 2017

c=-11

Explanation:

67=78+c

Remove all non-variable values from the right side.
67\color(indianred)(-78)=\cancel(78)+c\cancel(\color(indianred)(-78))
67-78=c

Simplifying that, we get c=-11.

Oct 3, 2017

c=-11

Explanation:

67=78+c
67+(-78)=78+c+(-78)
67-78=cancel(78)+c+cancel((-78))
c=67-78=-11