Question

x+2x=16-x
faça a equações

Answer 1

$x+2x=16-x\\2x+x+x=16\\4x=16\\x= \frac{16}{4} =4$

Answer 2

x + 2x = 16 - x
3x = 16 - x
3x + x = 16
4x = 16
x = 16/4
x = 4