` x - 4/5 = 6/35 + 3/7 `
` x - 4/5 = 3/5`
` x = 3/5 + 4/5`
`x= 7/5`
x-4/5=6/35+15/45
x-4/5=21/35
x-4/5=3/5
x=3/5+4/5
x=7/5
\(x-\dfrac{4}{5}=\dfrac{6}{35}+\dfrac{3}{7}\\ \Leftrightarrow x-\dfrac{4}{5}=\dfrac{21}{35}\\ \Leftrightarrow x=\dfrac{21}{35}+\dfrac{4}{5}\\ \Leftrightarrow x=\dfrac{7}{5}\)
x-4/5=6/35+15/35
x-4/5=21/35
x-4/5=3/5
x=3/5+4/5=7/5