Question 159385
{{{n = 5000c - (15300/4)}}} 
and 
{{{n = 1800}}} gallons of quantity

solve for {{{c}}}:

{{{n = 5000c - (15300/4)}}} ....move {{{(15300/4)}}} to the left

{{{n + (15300/4)= 5000c}}}....or {{{5000c = n + (15300/4)}}}

{{{5000c = n + (15300/4)}}}....divide both sides by {{{5000}}}

{{{5000c/5000 = n/5000 + (15300/4)/5000}}}...plug in {{{n=1800}}}

{{{c = 1800/5000 + (15300/4)/5000}}}...

{{{c = 18/50 + (153/4*50)}}}...

{{{c = 0.36 + 153/200}}}...

{{{c = 0.36 + (0.765)}}}...

{{{c = 1.125}}}...

check:

{{{n = 5000c - (15300/4)}}} 

{{{n =5625 -3825}}} 

{{{n =5625 -3825}}} 

{{{n =1800}}}