Answer:
See below 
Step-by-step explanation:
Hi there!
We want to solve for c (find the value of c) in 15=
To do that, isolate 1c (also written as c) on one side.
We can add 18 to both sides to remove it from the right side 
15= -18
-18
+18    +18
_______________
33=
You want to know how to solve an equation where the coefficient of a term is a fraction
Remember that we want to find the value of 1c. 
Multiplying a fraction by its reciprocal (the 'flipped' version of that fraction) will give 1. 
For example, multiplying  by
 by  (the reciprocal of
 (the reciprocal of  ) will give:
) will give: 

So therefore, we should multiply both sides by the reciprocal of  , which would be
, which would be 
Therefore, 

Multiply
 =
=
Simplify the fractions
88=c
Hope this helps!