\(3 + 2 \times 2 + 3x - (2 \times 7) = 0\)
\(3 + 4 + 3x - 14 = \)\(3x = 7\)
\(x = \frac{7}{3}\).
$xMn{O_4}^ - \, + \,y{H_2}S{O_4}\, \to \,2M{n^{2 + }}\, + \,5{H_2}O\, + \,z{e^ - }$
${H_2}O + B{r_2} \to HOBr + HBr$
$2F{e^{3 + }} + S{n^{2 + }} \to 2F{e^{2 + }} + \,\,A$