Question

3+(2х+3)^2=4(х-6)(6+х)

Answer 1

$3+4 x^{2} +12x+9=4 x^{2} -144$
$4 x^{2} +12x-4 x^{2} = -144-3-9$
$12x=-156$
$x= -13$
Ответ: -13