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 = 21/11.6 // - 21/11.6
x-(21/11.6) = 0
x-1.81034483 = 0
x-1.81034483 = 0 // + 1.81034483
x = 1.81034483
x = 1.81034483
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