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gasta: x*1/2=x/2 queda: x-x/2=x/2
transporte: x/10
x/2+x/10+20=x
(5x+x)/10+20=x
(6x+200)/10=x
6x+200=x*10
200=10x-6x
200=4x
200/4=x
50=x
tenia $50