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(3x + 5)cm = (2x + 20)cm
3x - 2x = 20 - 5
x = 15
Luego: 3x +5 = 3 (15) + 5 = 45 + 5 = 50 cm
2x +20 = 2 (15) + 20 = 30 + 20 = 50 cm
Como los 3 lados del triángulo equilátero miden 50 cm, su perimetro "p" sera:
p = 3 l, donde l = 50 cm
p = 3 (50 cm)
p = 150 cm