tìm X, Y thuộc Z: 2(x-1)+(x-1)-1=5

Question

2(x-1)+(x-2)=5

Answer 1

2(x-1)+(x-1)-1=5

(x-1)(2+1)=5+1

(x+1)3=6

x+1=6:3

x+1=2

x=2-1

x=1

Answer 2

2(x-1) + (x-2) = 5

2x - 2 + x - 2 = 5 

2x + x - 2 - 2 = 5

3x - 4 = 5

3x = 5 + 4 

3x = 9

x = 3

 

Answer 3

2(x-1)+(x-1)-1=5

(x-1)(2+1)=5+1

 (x+1)3=6

x+1=6:3

x+1=2

x=2-1

x=1