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y=x+1000
x+x+1000=25000
2x+1000=25000
2x=25000 - 1000
2x=24000
x=24000/2
x=12000
Ayer= 12000
Hoy= 12000 + 1000
Ayer= 12000
hoy= 13000
se suman los dos días y da = 25000