(164/x-164)x*300=0
164-164x/x*x*300=0
300x*(164-164x)/x=0
300(164-164x)=0
49200-49200x=0
-49200x=-49200
x=1
(164/x-164)x*300=0
164-164x/x*x*300=0
300x*(164-164x)/x=0
300(164-164x)=0
49200-49200x=0
-49200x=-49200
x=1