`x-1/10 = 1/15`
`x=1/15 + 1/10`
`x=2/30 + 3/30`
`x=5/30`
`x=1/6`
`1/15 - (1/3-x)=11/90`
`1/3-x=1/15-11/90`
`1/3-x=-1/18`
`x=1/3-(-1/18)`
`x=1/3+1/18`
`x=6/18+1/18`
`x=7/18`
`4/7 . x -2/3=1/5`
`4/7 .x = 1/5+2/3`
`4/7.x=13/15`
`x=13/15:4/7`
`x=91/60`
`(3/5x + 8):20=1`
`3/5x + 8 = 1.20`
`3/5 x + 8 =20`
`3/5x =20-8`
`3/5x =12`
`x=12:3/5`
`x=20`
\(a,x-\dfrac{1}{10}=\dfrac{1}{15}\)
\(x=\dfrac{1}{15}+\dfrac{1}{10}\)
\(x=\dfrac{5}{30}=\dfrac{1}{6}\)
____________________
\(b,\dfrac{1}{15}-\left(\dfrac{1}{3}-x\right)=\dfrac{11}{90}\)
\(\dfrac{1}{3}-x=\dfrac{1}{15}-\dfrac{11}{90}\)
\(\dfrac{1}{3}-x=\dfrac{-1}{18}\)
\(x=\dfrac{1}{3}-\dfrac{-1}{18}\)
\(x=\dfrac{7}{18}\)
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\(c,\dfrac{4}{7}x-\dfrac{2}{3}=\dfrac{1}{5}\)
\(\dfrac{4}{7}x=\dfrac{1}{5}+\dfrac{2}{3}\)
\(\dfrac{4}{7}x=\dfrac{13}{15}\)
\(x=\dfrac{13}{15}:\dfrac{4}{7}\)
\(x=\dfrac{91}{60}\)
______________________
\(d,\left(\dfrac{3}{5}x+8\right):20=1\)
\(\dfrac{3}{5}x+8=1.20\)
\(\dfrac{3}{5}x+8=20\)
\(\dfrac{3}{5}x=20-8\)
\(\dfrac{3}{5}x=12\)
\(x=12:\dfrac{3}{5}\)
\(x=\dfrac{60}{3}=20\)
