5^3x+1-5^3x-3 меньше или равно 624

$5^{3x+1} - 5^{3x-3} leq 624$

[ $5*5^{3x} - 5^{3x}*5^{-3} leq 624$

$5*5^{3x} - 5^{3x}* frac{1}{5^{3}} leq 624$

$5*5^{3x} - frac{5^{3x}}{125} leq 624$

$5^{3x}(5 - frac{1}{125}) leq 624$

$5^{3x}(frac{5*125-1}{125}) leq 624$

$5^{3x}(frac{624}{125}) leq 624$

$5^{3x} leq 125$

$5^{3x} leq 5^{3}$

3x ≤ 3
x ≤ 1

Ответ:(-∞;1]