If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
r = (c/2)*x // - (c/2)*x
r-((c/2)*x) = 0
r-1/2*c*x = 0 // - r
-1/2*c*x = -r // : -1/2*c
x = -r/(-1/2*c)
x = 2*c^-1*r
x = 2*c^-1*r
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