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Mathematics

Solve:

9x+72(xx27)=36\dfrac{9x + 7}{2} - (x - \dfrac{x - 2}{7}) = 36

Linear Eqns One Variable

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Answer

9x+72(xx27)=369x+72x+x27=369x+72x1+x27=36\dfrac{9x + 7}{2} - (x - \dfrac{x - 2}{7}) = 36\\[1em] ⇒ \dfrac{9x + 7}{2} - x + \dfrac{x - 2}{7} = 36\\[1em] ⇒ \dfrac{9x + 7}{2} - \dfrac{x}{1} + \dfrac{x - 2}{7} = 36

Since L.C.M. of denominators 2 and 7 = 14, multiply each term with 14 to get:

14(9x+7)2x×141+14(x2)7=36×14⇒ \dfrac{14(9x + 7)}{2} - \dfrac{x \times 14}{1} + \dfrac{14(x - 2)}{7} = 36 \times 14

⇒ 7(9x + 7) - x ×\times 14 + 2(x - 2) = 504

⇒ (63x + 49) - 14x + (2x - 4) = 504

⇒ 63x + 49 - 14x + 2x - 4 = 504

⇒ 51x + 45 = 504

⇒ 51x = 504 - 45

⇒ 51x = 459

⇒ x = 45951\dfrac{459}{51}

⇒ x = 9

Hence, the value of x is 9.

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