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4a + 12 = 7
4a = 7 - 12
4a = - 5
a = -5/4
Respuesta :
a = -5/4
4(a + 3) = 7
a + 3 = 7/4
a = 7/4 - 3
a = 7/4 - 12/4
a = (7 - 12)/4
a = - 5/4