4A. a) x+1/6 = -1/2 b) x-2/10 = 3/15 c) x-7/16 = 9/24

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1. $a)x+\dfrac{1}{6}=-\dfrac{1}{2}$

   $x=-\dfrac{1}{2}-\dfrac{1}{6}$

   $x=-\dfrac{3}{6}-\dfrac{1}{6}$

   $x=-\dfrac{4}{6}$

   $x=-\dfrac{2}{3}$

   Vậy `x in {2/3}`.

   $b)x-\dfrac{2}{10}=\dfrac{3}{15}$

   $x-\dfrac{1}{5}=\dfrac{1}{5}$

   $x=\dfrac{1}{5}+\dfrac{1}{5}$

   $x=\dfrac{2}{5}$

   Vậy `x in {2/5}`.

   $c)x-\dfrac{7}{16}=\dfrac{9}{24}$

   $x-\dfrac{7}{16}=\dfrac{6}{16}$

   $x=\dfrac{6}{16}+\dfrac{7}{16}$

   $x=\dfrac{13}{16}$

   Vậy `x in {13/16}`.

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2. a, x+$\frac{1}{6}$= -$\frac{1}{2}$ 

   ⇔        x     =-$\frac{1}{2}$- $\frac{1}{6}$ 

   ⇔        x =-$\frac{3}{6}$- $\frac{1}{6}$ 

   ⇔       x =-$\frac{4}{6}$

   ⇔        x =-$\frac{2}{3}$

   vậy x ∈ {-$\frac{2}{3}$}

   b, x-$\frac{2}{10}$= $\frac{3}{15}$ 

   ⇔ x-$\frac{1}{5}$ = $\frac{1}{5}$ 

   ⇔  x    =$\frac{1}{5}$ + $\frac{1}{5}$ 

   ⇔     x    =$\frac{2}{5}$ 

   vậy x ∈ {$\frac{2}{5}$ }

   c, x-$\frac{7}{16}$= $\frac{9}{24}$ 

   ⇔       x    =$\frac{9}{24}$ +$\frac{7}{16}$

   ⇔     x     =$\frac{3}{8}$ +$\frac{7}{16}$

   ⇔     x     =$\frac{6}{16}$ +$\frac{7}{16}$

   ⇔        x    =$\frac{13}{16}$

   vậy x ∈ {$\frac{13}{16}$ }

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