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x in (-oo:+oo)
a/c = (x+y)/y // - (x+y)/y
a/c-((x+y)/y) = 0
(-1*(x+y))/y+a/c = 0
(-1*c*(x+y))/(c*y)+(a*y)/(c*y) = 0
a*y-1*c*(x+y) = 0
a*y-(c*x)-(c*y) = 0
(a*y-(c*x)-(c*y))/(c*y) = 0
(a*y-(c*x)-(c*y))/(c*y) = 0 // * c*y
a*y-(c*x)-(c*y) = 0
a*y-c*x-(c*y) = 0 // - a*y-(c*y)
-c*x = -(a*y-(c*y)) // : -c
x = (-(a*y-(c*y)))/(-c)
x = -(c^-1*(c*y-(a*y)))
x = -(c^-1*(c*y-(a*y)))
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