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Perimetro = (20x - 14)
Base = (4x + 1)
Altura = A
Perimetro = 2* Base + 2 * Altura
(20x - 14) = 2(4x + 1) + 2 * A
20x - 14 = 8x + 2 + 2 * A
20x - 14 - 8x - 2 = 2 * A
12x - 16 = 2 * A Sacas del 1er termino de la ecuacion fac- tor comun 2
2(6x - 8) = 2 *A
2(6x - 8)/2 = A Simplificas el 2
6x - 8 = A
Respuesta.
El ancho es = 6x - 8