Question

x + 2x = 15. Tìm x

Answer 1

x+2x=15

=> x.(1+2)=15

=> x.3=15

=> x=15:3

=> x=5

Answer 2

5           

Answer 3

x + 2x = 15

x ( 1 + 2 ) = 15

x . 3 = 15

x = 15 : 3

x = 5

Answer 4

x+ 2x=15 => x(2+1) = 15 => 3x=15 => x=5

           Vậy x=5