Simplify:
`(2x + 5y)(3x + 4y) - (7x + 3y)(2x + y)`

Simplify (2x + y) (1 + 4x + 3y) -6x (x + y)

Simplify: 5 (x + 3y) -2 (3x-4y)

Simplify: (2x+3y)(3x+4y)-(7x+3y)(x+2y)

Simplify: (2x+3y)(3x4y)-(7x+3y)(x+2y)

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

Simplify: (3x+2y)(4x+3y)-\ (2x-y)(7x-3y)

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))