Two sides of an equilateral triangle measure (y+ 10) units and (y – 2) units. if the perimeter of the triangle is 21 units, what is the value of y

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# Two sides of an equilateral triangle measure (y+ 10) units and (y – 2) units. if the perimeter of the

Two sides of an equilateral triangle measure (y+ 10) units and (y – 2) units. if the perimeter of the triangle is 21 units, what is the value of y