While adding or subtracting,

We add subtract like terms

###
**
Add 3
**
**
π₯
**
**
& 4π₯
**

3π₯ + 4π₯

= π₯ (3 + 4)

= x × 7

= 7π₯

###
**
Add 8xy & 2π₯
**

8π₯y + 2π₯

Since 8π₯y & 2π₯ are unlike terms

We cannot add them

###
**
Add 8π₯y, 4π₯y & 2π₯y
**

8π₯y + 4π₯y + 2xy

= xy (8 + 4 + 2)

= xy (14)

= 14π₯y

###
**
Subtract 4n
**
**
from 7n
**

7n − 4n

= n(7 − 4)

= n × 3

= 3n

###
**
Subtract 5ab from 11ab
**

11ab − 5ab

= ab (11 − 5)

= ab × 6

= 6ab

Now,

Suppose our expressions are bigger

###
**
Add 3x + 11 & 7x − 5
**

(3π₯ + 11) + (7π₯ – 5)

*
We group like terms together
*

= (3x + 7x) + (11 − 5)

= 10π₯ + 6

###
**
Add (3x + 11 + 8z) & 7x − 5
**

(3π₯ + 11 + 8z) + (7x − 5)

= (3x + 7x) + (11 − 5 ) + 8z

= x (3 + 7) + (6) + 8z

= 10x + 6 + 8z

= 10x + 8z + 6

###
**
**
**
Subtract (a − b) from 3a − b + 4
**

(3a − b + 4) − (a − b)

= 3a − b + 4 − a + b

= (3a − a) + (−b + b) + 4

= (3a − a ) + (b − b) + 4

= 2a + 0 + 4

= 2a + 4