Simplify y :

y = `( 3x^6 + 4x^7 ) ( 3x^5 + 4x^8 )`

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

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

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

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))

If x : y = 3 : 4 find (3x + 4y) : (5x + 6y) .

Simplify: x^7 y^3 z^(-4) xx x^(-4) y^6 z^(-2) xx x^2 z^3

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