`3/4x+1/5x=7/10`
`=>(3/4 + 1/5) x= 7/10`
`=> ( 15/20 +4/20)x=7/10`
`=> 19/20 x = 7/10`
`=> x=7/10 : 19/20`
`=> x= 7/10 xx 20/19`
`=>x= 140/190`
`=>x= 14/19`
`-----------`
`2/7x+3/14x=1/2`
`=> (2/7 + 3/14) x=1/2`
`=> ( 4/14 + 3/14 )x=1/2`
`=> 7/14x=1/2`
`=> 1/2x=1/2`
`=>x=1/2 : 1/2`
`=>x=1`
`3/4.x+1/5.x=7/10`
`=>x.(3/4+1/5)=7/10`
`=>x.(15/20+4/20)=7/10`
`=>x. 19/20 =7/10`
`=>x =7/10:19/20`
`=>x = 140/190=14/19`
`2/7x+3/14x=1/2`
`=> 2/7.x+3/14.x=1/2`
`=> x .(2/7+3/14)=1/2`
`=>x.(4/14+3/14)=1/2`
`=>x.7/14=1/2`
`=>x.1/2=1/2`
`=>x=1/2:1/2`
`=>x=1/2xx2`
`=>x=2/2=1`
\(a,\left(\dfrac{3}{4}+\dfrac{1}{5}\right)x=\dfrac{7}{10}\\ \Rightarrow\left(\dfrac{15+4}{20}\right)x=\dfrac{7}{10}\\ \Rightarrow\dfrac{19}{20}x=\dfrac{7}{10}\\ \Rightarrow x=\dfrac{7}{10}:\dfrac{19}{20}\\ \Rightarrow x=\dfrac{14}{19}\\ b,\left(\dfrac{2}{7}+\dfrac{3}{14}\right)x=\dfrac{1}{2}\\ \left(\dfrac{4+3}{14}\right)x=\dfrac{1}{2}\\ \Rightarrow\dfrac{7}{14}x=\dfrac{1}{2}\\ \Rightarrow\dfrac{1}{2}x=\dfrac{1}{2}\\ \Rightarrow x=\dfrac{1}{2}:\dfrac{1}{2}\\ \Rightarrow x=1\)
