Jesse bought a novel for $<<7=7>>7.
She then bought lunch for twice the value of the novel, so lunch cost her $7 x 2 = $<<7*2=14>>14.
To find out how much money she has left from her gift she must know the total amount she spent $7 + $14 = $<<7+14=21>>21.
Her gift was $50, so she was left with $50 - $21 = $<<50-21=29>>29.
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