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si :
x/y = a/b
si:
x-a=20
si:
y-b=15
si:
b=6
tambien sabemos por propiedad
x - a / y- b = x / y = a / b
reemplazamos el dato x-a =20
reemplazamos el dato y-b=15
reemplazamos el dato b=6
20 / 15 = x / 21 = a / 6
20 / 15 = a / 6
20 * 6 / 15 = a
8=a
ESPERO Y ME HAYA EXPLICADO