Question

tìm x

 x * 2 + x * 3 + x * 4 = 2709

Answer 1

`x xx 2 + x xx 3 + x xx 4 = 2709`

`=> x xx ( 2 + 3 + 4 ) = 2709`

`=> x xx 9 = 2709`

`=> x = 2709 : 9`

`=> x = 301`