Đáp án+Giải thích các bước giải:
` 3| x-0,5|- 2x = x + 0,4`$\\$`3| x-0,5|=2x+x+0,4`$\\$`3| x-0,5|=3(x+2/15)`$\\$`| x-0,5|=x+2/15`$\\$`ĐK:x+2/15>=0=>x>=-2/15`$\\$`<=>`\(\left[ \begin{array}{l}x-0,5=x+\dfrac2{15}\\x-0,5=-x-\dfrac2{15}\end{array} \right.\)$\\$ `<=>`\(\left[ \begin{array}{l}x-x=\dfrac2{15}+0,5\\x+x=-\dfrac2{15}+0,5\end{array} \right.\) $\\$`<=>`\(\left[ \begin{array}{l}0=\dfrac{19}{30}(Loại)\\x=\dfrac{11}{60}(Thỏa mãn)\end{array} \right.\)
