`3 - [x - {2y - (5x + y - 3) + 2x^(2)} - (x^(2) - 3y)]`

Simplify : ( 3y ( x - y) - 2x ( y -2x))/( 7x ( x - y) - 3 ( x ^(2) - y ^(2)))

(5x + 3y) (5x-3y) (25x ^ (2) + 9y ^ (2))

3 x + 2y = 12 , 5x - 2y = 4 .

Simplify : (i) (5x - 9y) - (-7x + y) (ii) (x^(2) -x) -(1)/(2)(x - 3 + 3x^(2)) (iii) [7 - 2x + 5y - (x -y)]-(5x + 3y -7) (iv) ((1)/(3)y^(2) - (4)/(7)y + 5) - ((2)/(7)y - (2)/(3)y^(2) + 2) - ((1)/(7)y - 3 + 2y^(2))