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Lo que hay que restar lo llamas x
25/15 - x = 46/42
25/15 - 46/42 = x
(25 * 42)/(15 * 42) - (46 * 15)/(15 * 42) = x
1050/630 - 690/630 = x
(1050 - 690)/630 = x
360/630 = x Simplificas el cero
36/63 = x Simplificas sacas 3ra
(36/3)/(63/3) = x
12/21 = x Simplificas sacas 3ra
(12 / 3)/(21/3) = x
4/7 = x
Respuesta.
El numero que hay que restar a 25/15 para obtener 46/42 es 4/7