5x+ 2x = 6² - 5⁰

8x + 2x = 25.2²

(x² - 10) : 5 = 3

2x + 36 : 12 = 5³

2^x + 8 = 24

x : 12, x : 18 và x < 250

1200 : 2 + 6² . 2^{1 + 18} 

a, 15 + 5x + 40

b, 5x + 2x = 6² - 5⁰

8x + 2x = 25.2²

a, 198 - (x + 4) = 120

b, 2(x - 51) = 2.2² + 20

c, 450 : (x - 19) = 50

d, 4(x - 3) = 7² - 1¹⁰