@sad0708
a) x + $\frac{3}{4}$ = $\frac{8}{16}$
x = $\frac{8}{16}$ - $\frac{3}{4}$
x = - $\frac{1}{4}$
b) x ÷ $\frac{3}{7}$ = $\frac{35}{3}$
x = $\frac{35}{3}$ × $\frac{3}{7}$
x = 5
c) x × $\frac{4}{8}$ = $\frac{8}{4}$
x = $\frac{8}{4}$ ÷ $\frac{4}{8}$
x = 4