3×16^x +2×81^x= 5×36^x
3×16^x+2x81^x-5×36^x=0
3+2×(9/4)^2-5(9/4)^x=0
(9/4)^x=t,t,>0
2t^2-5t+3=0
(9/4)^x=1
(9/4)^x=3/2
x=0
x=1/2
