Объяснение:
{2x-10-7y+14=-5
{3x+9+4y-4=8
{2x-7y=10-5-14
{3x+4y=8-9+4
{2x-7y=-9|*(-3)
{3x+4y=3|*2
{-6x+21y=27
{6x+8y=6
29y=33
y=33/29
3x+4y=3
3x=3-4y
3x=3-(4*33)/29
3x=3-132/29
3x=-45/29
x=-45/29*1/3
x=-15/29
