Add:
(i) 8x, 3x
(ii) 7mn, 5mn
(iii) −9y, 11y, 2y

Subtract:
(i) 4k from 12k
(ii) 15q from 25q
(iii) 7xyz from 17xyz.

Find the sum of the following expressions
(i) 7p + 6q, 5p − q, q + 16p
(ii) a + 5b + 7c, 2a + 10b + 9c
(iii) mn + t, 2mn − 2t, − 3t + 3mn
(iv) u + v, u − v, 2u + 5v, 2u − 5v.
(v) 5xyz − 3xy, 3zxy − 5yx

Simplify
(i) (x + y − z) + (3x − 5y + 7z) − (14x + 7y − 6z)
(ii) p + p + 2 + p + 3 − p − 4 − p − 5 + p + 10
(iii) n + (m + 1) + (n + 2) + (m + 3) + (n + 4) + (m + 5)

Nine added to thrice a whole number gives 45. Find the number.

Find two consecutive odd numbers whose sum is 200.

Subtract −3ab − 8 from 3ab + 8. Also, subtract 3ab + 8 from −3ab − 8.

Thrice a number when increased by 5 gives 44. Find the number

Six times a number subtracted from 40 gives −8. Find the number.

From the sum of 5x + 7y − 12 and 3x − 5y + 2, subtract the sum of 2x − 7y − 1 and −6x + 3y + 9.

Find the expression to be added with 5a − 3b + 2c to get a − 4b − 2c?

Write any three expressions each having 4 terms:

Identify the co-efficients of the terms of the following expressions
(i) 2x - 2y
(ii) x + y + 3

Group the like terms together from the following : 6x, 6, -5x, - 5, l,x, 6y,y, 7y, 16x, 3

Give the algebraic expressions for the following cases:
(i) One half of the sum of a and b.
(ii) Numbers p and q both squared and added