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{10x-10y-4+4x=y
{x-3y-x+5y=-7
{14x-11y=4
{2y=-7 | :2
{14x-11y=4
{y=-3,5
{14x-11*(-3,5)=4
{y=-3,5
{14x+38,5=4
{y=-3,5
{14x=-34,5 | :14
{y=-3,5
{x=-2,46
10(x-y)-4(1-x)=y
x-3y-2x+x+5y=-7
10x-10y-4+4x=y
2y=-7 /:2
14x-11y=4
y=-3,5
14x-11(-3,5)=4
y=-3,5
14x+38,5=4
y=-3,5
14x=4-38,5
y=-3,5
14x=-34,5 /:14
y=-3,5
x≈-2,46