Estimate the unknown value — task. Mathematics CBSE, Class 7.

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Calculate the value of

$a$ if the measure of exterior angle

$∠x =$ 110

$°$ ,

$∠Q = ($ 3

$a+$ 8

$)°$ and

$∠R = (a+$ 7

$)°$ .

The value of

$a$ is.

$1$

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