If it's not what You are looking for type in the equation solver your own equation and let us solve it.
n in (-oo:+oo)
n = -9/2 // + -9/2
n-(-9/2) = 0
n+9/2 = 0
n+9/2 = 0 // - 9/2
n = -9/2
n = -9/2
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