Hilton had 26 marbles + 6 marbles - 10 marbles = <<26+6-10=22>>22 marbles.
Lori gave Hilton 2 * the 10 marbles that he lost = <<2*10=20>>20 marbles.
In total Hilton had 22 marbles + 20 marbles = <<22+20=42>>42 marbles.
#### 42