{ (x-5)² - (x+2)² = 7y
{ (y+4)² - (y-2) (y+2) = 8x
x2-10x+25-x2-4x+4=7y
y2+8y+8-y2-2=8x
-14x-7y=-29/*2
-8x-8y=-6/*-3.5
-28x-14y=-58
28x+28y=21
14y=-36/:14
y=-36/14
y=18/7
-14x-7y=-29
-14x+36=-29
-14x=-65/:-14
x=65/14
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{ (x-5)² - (x+2)² = 7y
{ (y+4)² - (y-2) (y+2) = 8x
x2-10x+25-x2-4x+4=7y
y2+8y+8-y2-2=8x
-14x-7y=-29/*2
-8x-8y=-6/*-3.5
-28x-14y=-58
28x+28y=21
14y=-36/:14
y=-36/14
y=18/7
-14x-7y=-29
-14x+36=-29
-14x=-65/:-14
x=65/14