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)
X = 21.5-(4/2.5) // - 21.5-(4/2.5)
X+4/2.5-21.5 = 0
X-19.9 = 0 // + 19.9
X = 19.9
X = 19.9
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