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/18 = 0.81 // - 0.81
x/18-0.81 = 0
1/18*x-0.81 = 0 // + 0.81
1/18*x = 0.81 // : 1/18
x = 0.81/1/18
x = 14.57999883
x = 14.57999883
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