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2b + 2h = P
2( 2x + 3 ) + 2 ( 3x - 1 ) = 24 quitamos paréntesis
4x + 6 + 6x - 2 = 24 trasponemos los términos independientes
4x + 6x = 24 + 2 - 6 hacemos la reducción
10x = 20
x = 20/10
x = 2
Calculamos las medidas
Base ........ 2x + 3 = 2( 2 ) + 3 = 4 + 3 = 7 cm
Altura ...... 3x - 1 = 3 ( 2 ) - 1 = 6 - 1 = 5 cm