Which value satisfies 3x + 9 = 21?

Type: MCQ • Marks: 1

A. x = 5

B. x = 21

C. x = 6

D. x = 4

Explanation

Substitute x = 4: 3 × 4 + 9 = 21. So x = 4 is the solution.

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Class 7th Ganita Prakash 2

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