Ре­ши­те урав­не­ние 9^3+x = 1.8 * 5^3+x

Question

Ре­ши­те урав­не­ние 9^3+x = 1.8 * 5^3+x

Answer 1

9^(3+x) = 1,8·5^(3 + x) |: 5^(3 +x)
(9/5)^(3 +x) = 1,8
9/5 = 1,8
1,8^(3 + x) = 1,8^1
3 +x = 1
x = -2