Respuesta:
735
Explicación paso a paso:
3a/5 + 4a/7 = a+126
21a/35 + 20a/35 = a + 126
41a/35 = a + 126
41a/35 - 35a/35 = 126
6a/35 = 126
a = 126*35/6
a = 735
Comprobación:
3*735/5 + 4*735/7 = 735 + 126
441 + 420 = 735 + 126 = 861
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Respuesta:
735
Explicación paso a paso:
3a/5 + 4a/7 = a+126
21a/35 + 20a/35 = a + 126
41a/35 = a + 126
41a/35 - 35a/35 = 126
6a/35 = 126
a = 126*35/6
a = 735
Comprobación:
3*735/5 + 4*735/7 = 735 + 126
441 + 420 = 735 + 126 = 861