Решите пожалуйста, срочно

Ответ: x=15, v=12

Объяснение:

$\left \{ {{\frac{x+v}{9} } -\frac{x-v}{3} =2\atop {\frac{2x-v}{6}-\frac{3x+2v}{3} =-20}} \right. \\\left \{ {{\frac{x+v}{9}-\frac{3(x-v)}{9}=2 } \atop {\frac{2x-v}{6}-\frac{2(3x+2v)}{6}=-20}} \right.\\\left \{ {{\frac{x+v-3x+3v}{9} =2} \atop {\frac{2x-v-6x-4v}{6}=-20 }} \right. \\\left \{ {{-2x+4v=2*9} \atop {-4x-5v=-20*6}} \right. \\\left \{ {{-2x=18-4v} \atop {2*(-2x)-5v=-120}} \right. \\2*(18-4v)-5v=-120\\36-8v-5v=-120\\-13v=-156\\v=156/13=12\\-2x=18-4*12\\-2x=-30\\x=15$