$\frac{(2x)^5 * (2x)^3 * 2}{(4x)^3 * 8x^4} = -3$
$\frac{(2x)^8 * 2}{(2^2x)^3 * 2^3 * x^4} = -3$
$\frac{2^8 * x^8 * 2}{2^6 * x^3 * 2^3 * x^4} = -3$
$\frac{2^9 * x^8}{2^9 * x^7} = -3$
x = −3

$\frac{(5x)^7 * (5x)^4 * 25}{(25x^2)^4 * 125x^2} = 100$
$\frac{(5x)^11 * 5^2}{(5^2x^2)^4 * 5^3 * x^2} = 100$
$\frac{5^11 * x^11 * 5^2}{5^8 * x^8 * 5^3 * x^2} = 100$
$\frac{5^13 * x^11}{5^11 * x^10} = 100$
$5^2x = 100$
25x = 100
x = 100 : 25
x = 4