Tìm x

Tìm x: 
a,8x + 2x = 25.2^2
b, 5x + 2x = 6^2 - 5^0
c,5x + x = 150 : 2 + 3
d,2^x : 2^5 = 1
e, 5x + 3x = 3^6 : 3^3. 4 + 12
g,4x + 2x = 68 – 2 19 : 2 16
h,7x – x = 5^21 : 5^19 + 3.2^2 - 7^0
i,7x – 2x = 6^17 : 6^15 + 44 : 11
k,5x + x = 39 – 3^11 :3^9