If (5x-9) = 51, then 7x + 2 = ?

A 84

B 48

C 50

D 86

Solution

Correct Answer: Option D

(5x-9) = 51
⇒ 5x = 51+9 = 60
⇒ 5x = 60
⇒ x = 12

∴ 7x + 2 = 7.12 + 2 = 84+ 2 = 86

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