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marina=y soles
(1)........por dato x+y=120 ,por lo tanto : x=120-y
(2).......la ecuación seria esta
(y+10)=2(x-10)
y+10=2x-20
10+20=2x-y
30=2x-y
remplazando x de (1)
30=2(120-y)-y
30=240-2y-y
3y=210
y=70
ENTONCES karina tendría 70 soles