In a battle of the sequels — and the sexes — Denzel Washington's R-rated action pic out-gunned the $34.4m debut of 'Mamma Mia 2.' In a summer box-office upset, Sony's R-rated The Equalizer 2 came in ahead of expectations to beat the star-studded Mamma Mia!: Here We Go Again with an estimated $35.8 million launch in North America. Mamma Mia! Here We Go Again grossed an estimated $34.4 million. The numbers could shift when final weekend earnings are tallied on Monday. The female-fueled Mamma Mia 2 is by no means a disappointment and opened in line with expectations. As it...