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Solve: ("X" - 4)/7 = "X + 3"/7 + "X + 4"/5 - Mathematics

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Question

Solve: `("x" - 4)/7 = "x + 3"/7 + "x + 4"/5`

Sum
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Solution

`("x" - 4)/7 = "x + 3"/7 + "x + 4"/5`

⇒ `("5x" - 20 = 5x + 15 + 7x + 28)/35`

⇒ 5x - 5x - 7x = 15 + 28 + 20

⇒ - 7x = 63 

⇒ x = `63/-7 = -9`

∴ x = - 9

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Chapter 12: Simple Linear Equations (Including Word Problems) - Exercise 12 (C)

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Selina Concise Mathematics [English] Class 7 ICSE
Chapter 12 Simple Linear Equations (Including Word Problems)
Exercise 12 (C) | Q 28
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