$Δ A B C$ is an isosceles triangle with AC = BC. Find the value of 'x - y'.

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Solution

Given, in $Δ A B C$ , AC = BC.
$\Rightarrow ∠ B = ∠ C$
[In a triangle, the angles opposite to equal sides are equal ]
$\Rightarrow$ x - 3 = y - 7
$\Rightarrow$ x - y = 3 - 7
$∴$ x - y = - 4

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