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प्रश्न
If 3x + 18° and 2x + 25° are supplementary, find the value of x.
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उत्तर
∵ 3x + 18° and 2x + 25° are supplementary angles
∴ 3x + 18° + 2x + 25° = 180°
⇒ 5x + 43° = 180°
⇒ 5x = 180°− 43° = 137°
⇒ x =`(137°)/5` = 27.4° or 27° 24′
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