Identify the signs or number to be interchanged so that outcome of the expression is correct
$4 \times 8 = 21 - 9$

+ = -

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- = +

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- + =

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= + -

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= - +

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Solution

The correct option is A $+ = -$
The new equation is $4 + 8 = 21 - 9$
Therefore, new set of sign is Option A

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