\(d,\dfrac{2x+1}{-3}=-\dfrac{7}{11}\)
\(\Leftrightarrow11\left(2x+1\right)=-7\left(-3\right)\)
\(\Leftrightarrow22x+11-21=0\)
\(\Leftrightarrow22x=10\)
\(\Leftrightarrow x=\dfrac{5}{11}\)
\(e,x:\dfrac{1}{3}=\dfrac{12}{99}:\dfrac{15}{90}\)
\(\Leftrightarrow x:\dfrac{1}{3}=\dfrac{12}{99}.\dfrac{90}{15}\)
\(\Leftrightarrow x:\dfrac{1}{3}=\dfrac{8}{11}\)
\(\Leftrightarrow x=\dfrac{8}{11}.\dfrac{1}{3}\)
\(\Leftrightarrow x=\dfrac{8}{33}\)
`d) (2x+1)/(-3) = (-7)/11`
`=> 11(2x +1) = 21`
` 2x +1 =21/11`
`2x = 21/11 - 1 =10/11`
`x = 10/11 :2 = 5/11`
`e) x : 1/3 = 12/99 : 15/90`
` 3x = 12/99 * 90/15 = 8/11`
`x = 8/11 :3 = 8/33`
