4*3^(x-1)+3^(x+1)=117
Замена 3^x=t
4/3*t+9*t=117
31/3*t=117
t=117/31
3^(x-1)=3*117/31
x-1=log[3] (117/31)
x=1+log[3](117/31)
4*3^(x-1)+3^(x+1)=117
Замена 3^x=t
4/3*t+9*t=117
31/3*t=117
t=117/31
3^(x-1)=3*117/31
x-1=log[3] (117/31)
x=1+log[3](117/31)