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If = 34x-2 and = x + 6, then find the value of: 2 – 32 - Mathematics

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Question

If = `3/4x - 2` and = x + 6, then find the value of:

2 – `3/2`

Sum

Solution

Given, = `3/4x - 2` and = x + 6

2 – `3/2`  = `2 xx (12 + 6) - 3/2(3/4 xx 1 - 2)`

= `36 - 3/2((3 - 2 xx 4)/4)`

=  `36 - 3/2((3 - 8)/4)`

= `36 - 3/2((-5)/4)`

= `36 + 15/8`

= `(36 xx 8 + 15)/8`

= `(288  + 15)/8`

= `303/8`

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Chapter 10: Algebraic Expressions - Exercise [Page 327]

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NCERT Exemplar Mathematics [English] Class 7
Chapter 10 Algebraic Expressions
Exercise | Q 90 (ii) | Page 327

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