[tex]\displaystyle\bf\\\left \{ {{4x - 5y =10 \: \: | \times 3 } \atop {2x + 15y = - 18 }} \right. \\ \displaystyle\bf\\ + \left \{ {{12x - 15y = 30} \atop {2x + 15y = - 18 }} \right. \\ \\ 12x + 2x = 30 - 18 \\ 14x = 12[/tex]

Ответ: В)