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b-12 2
2a-3b= -12
a = 5 .......4a=5b.......4a-5b=0
b 4
hacemos reduccion
-2(2a-3b= -12).............-4a+6b=24
4a-5b=0....................4a-5b=0
b=24
si b=24
4a=5b
4a=5(24)
4a=120
a=120/4
a=30
la edad actual de a: es 30 años