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3x²/5 = 2x/7
21x² = 10x
21x² -10x = 0
x(21x -10) = 0
x = 0 21x -10 =0
21x = 10
x = 10/21
y²/(2-x) = 3y/(2-x)
(y² -3y)/(2-x) = 0
y² -3y =0 2-x =0
y(y -3) = 0 x = 2
y =0 y -3 =0
y = 3
(x-7)/(x-2) + (x+4)/(x+2) =1
(x-7)*(x+2) +(x+4)(x-2)/(x-2)(x+2) =1
x² +2x -7x-14 +x² -2x +4x -8 = x² -4
2x² -3x - 22 -x² +4 =0
x² - 3x -18=0
21x² = 10x
21x² -10x = 0
x(21x -10) = 0
x = 0 21x -10 =0
21x = 10
x = 10/21
y²/(2-x) = 3y/(2-x)
(y² -3y)/(2-x) = 0
y² -3y =0 2-x =0
y(y -3) = 0 x = 2
y =0 y -3 =0
y = 3
(x-7)/(x-2) + (x+4)/(x+2) =1
(x-7)*(x+2) +(x+4)(x-2)/(x-2)(x+2) =1
x² +2x -7x-14 +x² -2x +4x -8 = x² -4
2x² -3x - 22 -x² +4 =0
x² - 3x -18=0
D = (-3)² - 4·1·(-18) = 81
x1 = (3 - √81)/2·1 = -3
x2 = (3 + √81)/2·1 = 6
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