Question

уравнение 24590 - х * 25 = 815

6900 : (150-х)= 30

Answer 1

24590 - х * 25 = 815

25х = 24590 - 815

25х =  23775

х = 23775 : 25

х = 951

24590 - 951 * 25 = 815

 

6900 : (150-х)= 30

6900 = 30(150-х)

6900 = 4500 - 30х

30х = 4500 - 6900

30х = -2400

х = -2400 : 30

х = -80

6900 : (150 - (-80)) = 6900 : (150 + 80) = 6900 : 230 = 30 

 

Answer 2

24590-25х=815

25х=24590-815

25х=23775

х=23775/25

х=951

6900 : (150-х)=30

150-х=6900/30

150-х=230

х=150-230

х=-80