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La fórmula para calcular el perímetro de un rectángulo es
2b + 2h = P sustituimos valores
2x + 2(x-7) = 154 quitamos paréntesis
2x + 2x - 14 = 154
4x = 168
x = 168/4
x = 42
La base del rectángulo mide 42 m
La altura mide 35 m