Verified answer

 Х*60+260=800

60х=800-260

60х= 540

х=540:60

х= 9

 450+С/8=500

с:8=500-450

с:8=50

с=50*8

с=400 

x*60+260=800

x*60=800-260

x*60=540

x=540/60

x=4

4*60+260=800

           800=800

450+c/8=50

c/8=450-50

c/8=400

c=400/8

c=50

450+3200/8=500

               500=500