Question

y-420•14=800  . y•40=3280•12

Answer 1

y-420•14=800           

y-5880=800

y=5880+800

у=6680

проверка

6680-420•14=800

800=800

 

y•40=3280•12

y•40=39360

y=39360/40

y=984

проверка

984•40=39360

39360=39360