Respuesta :

Billymkhoi
7c+ 12= -4c+ 78
⇒ 7c+ 4c= 78 -12 (inverse operation)
⇒ 11c= 66
⇒ c= 66/11 (inverse operation)
⇒ c= 6

Final answer: c= 6.
dahamivherath
cancel each type...
7c+12=-4c+78
+4c +4c
11c+12=78
-12 -12
11c=66
÷11 ÷11
=c=6

answer=6
hope it helps....