a) `x-2/5 =1-x/6`
`x+x/6=1+2/5`
`x.(1+1/6)=7/5`
`x . 7/6 =7/5`
`x=7/5 : 7/6`
`x=6/5`
b) `22/5 +1/2 .x^2=4. 8/5`
`22/5 + 1/2 .x^2=32/5`
`1/2 .x^2=32/5-22/5`
`1/2 .x^2= 2`
`x^2 = 2: 1/2`
`x^2=4`
`x=2^2=(-2)^2`
c) `7/2 -|x-1/3|=5/2`
`|x-1/3|=7/2-5/2`
`|x-1/3|=1`
\(\left[ \begin{array}{l}x-\dfrac{1}{3}=1\\x-\dfrac{1}{3}=-1\end{array} \right.\)
\(\left[ \begin{array}{l}x=1+\dfrac{1}{3}\\x=-1+\dfrac{1}{3}\end{array} \right.\)
\(\left[ \begin{array}{l}x=\dfrac{4}{3}\\x=\dfrac{-2}{3}\end{array} \right.\)
