Question

Помогите решить,пожалуйста.
Log6(x^2+7x)=Log6(8x+42).
Log3(21-x)=log3(x-7)+2.
Log2(x^2-4x)=log2(6x-16).

Answer 1

log(x(x+7)+log(8x+42)

log(x(x+7))-log(4x+21)+log(2)

log(x(x+7))/log(6)=log(8x+42)/log(6)