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Base = x
Altura = x - 7
Perimetro = 154
Formula.
Perimetro = 2 * Base + 2 * Altura
154 = 2 x + 2(x - 7)
154 = 2x + 2x - 14
154 + 14 = 4x
168 = 4x
168/4 = x
42 = x
Base = x = 42
Altura = x - 7 = 42 - 7 = 35
Respuesta.
La base del rectangulo vale 42m y la altura 35m
x-7+x=77
2x=77+7
x=84/2 Miden 35 cada lado
x=42
x-7=
42-7=35