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/676 = 0.21 // - 0.21
x/676-0.21 = 0
1/676*x-0.21 = 0 // + 0.21
1/676*x = 0.21 // : 1/676
x = 0.21/1/676
x = 141.95999432
x = 141.95999432
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