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)
n = l-(r/d)+1 // - l-(r/d)+1
r/d-l+n-1 = 0
d^-1*r-l+n-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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