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a + 7 + 6a = 5 + 3a + 10
7a + 7 = 3a + 15
7a - 3a = 15 - 7
4a = 8
a = 8/4
a = 2
Respuesta.
a = 2
4a-8=0
4a=8
a=8/4
a=2