Tìm x:
a) 5x + x = 39 – 3^11:3^9
b) 7x – x = 5^21 : 5^19 + 3. 2^2 - 7^0
c) 7x – 2x = 6^17: 6^15 + 44 : 11
d) 0 : x = 0
e) 3^x = 9
f) 4^x = 64
g) 2^x = 16
h) 23 + 3x = 5^6 : 5^3
k) 9^x- 1 = 9
l) x^4 = 16
m) 2^x : 2^5 = 1
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