Question

115-6*X=73 (4900/Y-280)/60=7

Answer 1

115-6*х=73

6*х=115-73

6х=42

х=42:6

х=7

115-6*7=73

        73=73 

4900:у-280):60=7

(4900:у-280)=7*60

4900:у=420+280

4900:у=700

у=4900:700

у=7

(4900:7-280):60=7

                     7=7

Answer 2

$115-6x=73$

 

$6x=115-73$

 

$6x=42$

 

$x=42:6$

 

$x=7$

______________________________________________

$115-6cdot7=73$ (это проверка)

 

$115-42=73$

 

$73=73$

==============================================

$(4900:y-280):60=7$

 

$frac{4900:y-280}{60}=frac{7}{1}$

 

$4900:y-280=7cdot60$

 

$4900:y-280=420$

 

$4900:y=420+280$

 

$4900:y=700$

 

$frac{4900}{y}=frac{700}{1}$

 

$y=4900:700$

 

$y=7$

______________________________________________

$(4900:7-280):60=7$

 

$(700-280):60=7$

 

$420:60=7$

 

$7=7$