{3(2x-y)-5(x+y)=-7
{2(x+4y)-5y=5
6x - 3y -5x - 5y =-7
2x + 8y - 5y = 5
x -8y = -7
2x + 3y = 5
x = -7 + 8y
2(-7 + 8y) + 3y = 5
-14 + 16y + 3y = 5
19y = 5 + 14
19y = 19
y = 1
x = -7 + 8 * (1)
x = 1
ответ (1; 1)
{3(2x-y)-5(x+y)=-7
{2(x+4y)-5y=5
6x - 3y -5x - 5y =-7
2x + 8y - 5y = 5
x -8y = -7
2x + 3y = 5
x = -7 + 8y
2(-7 + 8y) + 3y = 5
-14 + 16y + 3y = 5
19y = 5 + 14
19y = 19
y = 1
x = -7 + 8 * (1)
x = 1
ответ (1; 1)