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12a+3a+10=60+5
15a +10=65
15a=55
a = 55 11
----- = ----
15 3
SALU2
RESOLVIENDO:
=================
12 a + 3 a + 10 = 60 + 5
15 a + 10 = 65
15 a = 65 - 10
15 a = 55
a = 55 /15
a = 11/3
COMPROBAMOS:
================
12 a + 3 a + 10 = 60 + 5
12(11/3) + 3(11/3) + 10 = 65
44 + 11 + 10 = 65
65 = 65 ==>>> CORRECTO
RESPUESTA:
============
El valor de : a = 11/3