[tex]x + \frac{3}{7 } = \frac{5}{7} [/tex]
[tex] \frac{7x + 3}{7} = \frac{5}{7} [/tex]
[tex](7x + 3) \times 7 = 5 \times 7[/tex]
by cross multiplication.
[tex]49x + 21 = 35[/tex]
[tex]49x = 35 - 21[/tex]
[tex]49x = 14[/tex]
[tex]x = \frac{14}{49} [/tex]
[tex]x = \frac{2}{7} [/tex]
