Hasil dari 3^x. 27^x-1=81

3^x.27^x-1 = 81
81^2x-1 = 81
81 dicoret
2x-1 = 0
2x = 1
x= ½

(3^x.3^3x) -1 -81=0
(3^4x) -1 -3^4=0
(3^4x-3^4) -1 =0
3^4x-4 = 1
3^4x-4 = 3^0
[3 dicoret]
4x-4 = 0
4x = 4
X = 1