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Q.

Given: 8(2x  5)  6(3x  7) = 1

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a

1

b

-1

c

12

d

-12

answer is D.

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Detailed Solution

Given: 8(2x  5)  6(3x  7) = 1

On simplifying the brackets, we get:

=> (8 × 2x)  (8 × 5)  (6 × 3x) + (-6) × (-7) = 1   => 16x  40  18x + 42 = 1   => 16x  18x + 42  40 = 1   => - 2x + 2 = 1   => - 2x = 1 - 2   => 2x = 1

 => x =12

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