Question

Решите уравнение:
(1-9х)(6-х) + 7х-1 = 3х(3х+6)

Answer 1

(1-9х)(6-х) + 7х-1 = 3х(3х+6)
6-x-54x+9x^2+7x-1=9x^2+18x
6-x-54x+9x^2+7x-1-9x^2-18x=0
-66x+5=0
-66x=-5
x=5/66