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x = medida de la base
x-7 = medida d e la altura
P = 2x +2(x-7)
74 = 4x -14
x = (74+14)/4
x = 22 cm // medida de la base
altura = x-7 = 22-7 = 15 cm
prueba
74 = 2*15+2*22
74 = 30 + 44
74 = 74
Las dimensiones del rectángulo son 22 cm de base y 15 cm d e altura