Suppose David and Mohan have started walking from zero position in opposite directions, Let the steps to right of zero be represented by '+' sign and to the left of zero be represented by ‘-’ sign. If Mohan moves 5 steps to the right of zero it can be represented as +5 and if David moves 5 steps to the left of zero it can be represented as -5. Now, represent the positions with ‘+’ or ‘-’ sign:
6 steps to the left of zero.

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Solution

As moving left is represented with ‘-’ sign.
So, 6 steps to the left of zero = $- 6$ .

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As moving left is represented with ‘-’ sign.So, 6 steps to the left of zero = -6.

As moving left is represented with ‘-’ sign.
So, 6 steps to the left of zero = $- 6$ .