if x8 = 20 then x = - eighth root of 20 or x = eighth root of 20
eighth root of 20 = 1.4542154....
Maybe you mean 8x = 20
If so Ln (8x) = Ln (20) => x Ln(8)= Ln(20) => x = Ln(20)/Ln(8) = 1.4406426...
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how do you solve 8+x=x+8
x+8=20+12
2.45
0.05 = 1/20 (1/20)^6 = 1/64000000 = 1.5625 x 10^-8
x=15