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5a - 2m = -6
despejando el segundo:
5a = -6 + 2m
a = (2m - 6) / 5
a = 2/5m - 6/5
reemplazando en la primera:
2(2/5m - 6/5) + 3m = -10
4/5m - 12/5 + 3m = -10
4/5m + 3m = -10 + 12/5
19/5m = -38/5
m = -2
y reemplazando en el despeje anterior, hallamos "a"
a = 2/5 x (-2) - 6/5
a = -2
y haciendo la comprobacion:
2 x (-2) + 3 x (-2) = -10
-4 - 6 = -10
5 x (-2) - 2 x (-2) = -6
-10 + 4 = -6
saludos.-