Question

3x (2-3x)+9x (x+1)=10

Answer 1

$3x(2-3x)+9x(x+1)=10$
$6x-9x^2+9x^2+9x=10$
$6x+9x=10$
$15x=10$
$x= \frac{10}{15}$
$x= \frac{2}{3}$
Ответ: $\frac{2}{3}.$

Answer 2

=6x-9x^2+9x^2+9x-10=15x-10