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What is the value of x in the proportion?

Step-by-step explanation:

Cross multiply on both sides

= (x + 1) (21) = 15(x + 3)

= 21x + 21 = 15x + 45

Bringing like terms on one side

21x - 15x = 45 - 21

= 6x = 24

x = 24/6 = 4

Option A is the correct answer

Let us now place 4 in the place of x and see if the substitution is equivalent to :

Therefore, the value of x in this proportion = 4

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step-by-step explanation:

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step-by-step explanation: