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B=BETO
AHORA
A=3B
ANTES
A-5=4(B-5)
DESPEJAS
A-5=4(B-5)
A-5=4B-20
A=4B-20+5
A=4B-15
SUSTITUYES EN LA PRIMERA
(4B-15)=3B
4B-3B=15
B=15
A=3B
A=3(15)=45
A=45 Y B=15
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