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6. Find the area using suitable identity

If the rectangular cardboard is of dimension

(x + 5)

units and

(x - 12)

units, then find the area of the cardboard.

$x^{2} - 7 x - 60$
$x^{2} - 18 x - 66$
$x^{2} - 12 x - 58$
$x^{2} + 7 x + 60$

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