Решите систему уравнений(на картинке)

( z + v )/15 - ( z - v )/3 = 1 Z + v - 5( z - v ) = 15 z + v - 5z + 5v = 15 6v - 4z = 15 •••••••••••••• ( 2z - v )/6 - ( 3z + 2v )/3 = - 25 2z - v - 2( 3z + 2v ) = - 25•6 2z - v - 6z - 4v = - 150 - 5v - 4z = - 150 ••••••• 5v + 4z = 150 6v - 4z = 15 11v = 165 v = 15 6•15 - 4z = 15 4z = 90 - 15 z = 75 : 4 z = 18,75 Ответ z = 18,75 v = 15