X 4 5x 3 10x 2 20x 24 July 8, 2019 16 32 64 128 5 * 4 ^ x + 3 * 10 ^ x = 2 * 25 ^ x 5 ⋅ 4 x 2 + 4 x + 20 ⋅ 10 x 2 + 4 x − 1 − 7 ⋅ 25 x 2 + 4 x = 0
