Simplify:

(i) 5x + 3y - 8z + 2y - 3x + 5z + z - 7y - 2x

(ii) 4x³ - 2x² + 5x - 1 + 8x + x² - 6x³ + 7 - 6x + 3 - 3x² - x³

(iii) 2x² + 3xy - 3y² + x² - xy + y²

(iv) 2 - 3z² + 5yz + 7y² - 8 + z² - 6yz - 9y² + 1 - 2z² - 2yz - y²

(v) 2m - 3n + 5p + 2m + n - 2p - 3m - 4n + p

The two adjacent sides of a rectangle are 3a - b and 6b - a. Find its perimeter.

Subtract:

(i) 3a - 2b + 4c from 5a - 3b - 5c

(ii) 5x² - 3xy - 7y² from 3x² - xy - 2y²

(iii) 3p³ - 5p²q + 2q² from q² + p²q - 4p³

(iv) ab - bc - ca from 3ab + 2bc - 4ca

(v) 3z³ - 2z² + 7z - 8 from 8 - z - z²

(vi) 2abc - a² - b² from b² + a² - 2abc

(i) Subtract 6x³ - 5x² + 4x - 3 from the sum of x + 2x² - 3x³ and 2 - x² + 6x - x³.

(ii) Subtract the sum of a + 2b - 3c and 2c - 3b - 4a from the sum of 5b - 4c + a and 2c - 3b - 4a.

(iii) Subtract the sum of x² - 5xy + 2y² and y² - 2xy - 3x² from the sum of 6x² - 8xy - y² and 2xy - 2y² - x².