Answer:
[tex]{ \bf{1.}} \\ { \tt{ \frac{a}{x} + \frac{b}{x} = 1 }} \\{ \boxed { \tt{x = a + b}}} \\ \\ { \bf{2.}} \\{ \tt{ax + ab = c}} \\ { \boxed{ \tt{x = \frac{c - ab}{a} }}}[/tex]
[tex]{ \bf{1.}} \\ { \tt{ \frac{a}{x} + \frac{b}{x} = 1 }} \\{ \boxed { \tt{x = a + b}}} \\ \\ { \bf{2.}} \\{ \tt{ax + ab = c}} \\ { \boxed{ \tt{x = \frac{c - ab}{a} }}} \\ \\ { \bf{3.}} \\ { \tt{ax - bx = bc )}} \\ { \boxed{ \tt{x = \frac{bc}{a - b} }}} \\ \\ { \bf{4.}} \\ { \tt{ab = cx + ax}} \\ { \boxed{ \tt{x = \frac{ab}{c + a} }}} \\ \\ { \bf{5.}} \\ { \tt{ \frac{x}{2a} + \frac{x}{3a} = b }} \\{ \tt{x(3a + 2a) = 6 {a}^{2}b }} \\ { \boxed{ \tt{x = \frac{6 {a}b }{5} }}} \\ \\ { \bf{6.}} \\ { \tt{ax - bx = bc - bx}} \\ { \boxed{ \tt{x = \frac{bc}{a} }}}[/tex]
