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3 times the sum of n and 2 is 12.

2n – 3 = 12

The sum of a number n and 4

2n + 4 = 12

Two sides of a triangle have equal measures, and the third side is four more than the length of one of the sides. The perimeter of the triangle is 12 cm.

Yusef is 2 more than 3 times as old as his brother Musa. If Yusef is 12 years old, write an equation that could be used to determine Musa's age. (Let n represent Musa's age).

3(2n + 1)

n – 2 = 12

3 times a number n increased by 1

4 less than a number n

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3(n + 2) = 12

Three less than twice a number n is 12

n + 4

Joaquin has 4 more than twice as many concert t-shirts than Matt. If Joaquin has 12 concert t-shirts, write an equation that could be used to determine the number of t-shirts that Matt has? (Let n represent the number of Matt's t-shirts)

3n + 4 = 12

3n + 2 = 12

What expression could be used to find the area of the rectangle shown below?

A number n decreased by 2 is 12.

3n + 1

n – 4