(4/5+1/4)÷7/3+7/10=(16/20+5/20)×3/7+7/10=21/20x3/7+7/10=9/20+14/20=23/202/3x+1/2x=424x+3x=42*67x=42*6x=363/4:x=3:123x=9x=3