Question 175964
1. 7a- b= 15a, for a
7a-15a=b combine the a terms.
-8a=b divide both sides by -8
a=b/-8 ans.

2.8c + 6j =5p, for c
8c=5p-6j subtrsct -6j from both sides. 
c=(5p-6j)/8 ans. divide both sides by 8.