Find the value of $x$ when:
In a triangle each side $x - 2$ and perimeter equals to $15$ units

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Solution

Given each sides of a triangle is $x - 2$ . Then its perimeter is $3 (x - 2) = 3 x - 6$ .
According to the problem,
$3 x - 6 = 15$
or, $x = 7$ .

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