Answer:
x = 2.0172
Step-by-step explanation:
2.2^x+2.2^-3=5
-> 2.2^x+0.093914 = 5
-> + -0.93914 + -0.93914
-> 2.2^x = 4.906086
-> x = log(4.906086/log(2.2)
-> x = 2.0172
