On the occasion of New year a super market announces a discount of 20 percent on every item. if they labeled price of an article is rs 840 how much should a customer pay for it

Step - 1: Calculate 20% of 840.

Step - 2: Subtract from 840.

x= -3

step-by-step explanation:

step 1: simplify brackets

4 - x - 1 = 6

step 2: simpilfy

3 - x = 6

step 3: subtract 3 from both sides

-x = 6 - 3

step 4: simpilfy 6 - 3

-x = 3

step 5: multiply both sides by -1

x = -3