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/2.1 = 2.5 // - 2.5
X/2.1-2.5 = 0
0.47619048*X-2.5 = 0 // + 2.5
0.47619048*X = 2.5 // : 0.47619048
X = 2.5/0.47619048
X = 5.24999996
X = 5.24999996
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