x + x + x + 21 g
21 g + 3 x
3 (7 g + x)
x = -7 g
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Respuesta:
Aporte
x + x + x + 21 g
Resultado
21 g + 3 x
Forma alternativa
3 (7 g + x)
Raíz real
x = -7 g
Raíz
x = -7 g