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/1.8 = 2.1 // - 2.1
x/1.8-2.1 = 0
0.55555556*x-2.1 = 0 // + 2.1
0.55555556*x = 2.1 // : 0.55555556
x = 2.1/0.55555556
x = 3.77999997
x = 3.77999997
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