17=10*7
10*5=50
7*5=35
50+35=85
-----------------------------------
17=20-3
20*15=300
3*15=45
300-45=255
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17=10*7
10*5=50
7*5=35
50+35=85
-----------------------------------
17=20-3
20*15=300
3*15=45
300-45=255