Răspuns:
x=0
Explicație pas cu pas:
[tex]\frac{(x)+(2x)+(3x)}{3} =4x\\\\\frac{x+2x+3x}{3} =4x\\\\\frac{6x}{3} =4x\\\\2x=4x[/tex]
[tex]2x=4x|-4x\\\\-2x=0|:2\\\\\frac{-2x}{2} =\frac{0}{2} \\-1x=0\\-x=0|:-1\\\\\frac{-x}{-1} =\frac{0}{-1} \\x=0[/tex]
Succes! :)
