Said fighter against AC 17 with Advantage would do 7*(6.3+15)*.64+(3+15)*.64 or 106.94 pts of damage.
Without Advantage, he would do 7*(6.3+15)*..4+(3+15)*.64 or 66.4 pts of damage.
If fighter was armed with Longsword & Shield, had Dueling, Shield Master, and Savage Attacker
With Advantage, he...