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The result obtained by adding 4 to twice a number is the same as subtracting 9 from thrice that number. Find that number.

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answer is D.

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Detailed Solution

Concept- Let x be the number. Form the equation then using the stated condition, which is that adding 4 to 2x will equal

. The value of x, the necessary number, can then be determined by solving the equation that has been created.
Let the required number be

.
The answer to the question is that adding 4 to 2x equals the difference between 3x and 9.
That is,

Add like terms

Divide both sides by

Hence, the correct answer is option 4) 13

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