Question

решите уравнение плиз 4х+9=12-7х

Answer 1

$4x+9=12-7x$
$4x+7x=12-9$
$11x=3$
$x=\frac{3}{11}$

Answer 2

$4x+9=12-7x\\\\4x+7x=12-9\\\\11x=3\;\;|:11\\\\ \boxed{x= \frac{3}{11}}$