Question

Я отдаю все мои балы прлшу помлгите((((​

Answer 1

$3x + 4(x - 3) = 3.6(x + 3) \\ 3x + 4x - 12 = 3.6x + 10.8 \\ 7x - 12 = 3.6x + 10.8 \\ 7x - 3.6x = 10.8 + 12 \\ 3.4 = 22.8 \\ x = \frac{114}{17}$