Tìm x , biết : - 2,5 - x = 15/6

a) \(\left( { - 2,5} \right) - x = \frac{{15}}{6}\)

            \( - x = \frac{{15}}{6} + 2,5\)

             \( - x = \frac{5}{2} + \frac{5}{2}\)

              \( - x = 5\)                          

                 \(x = - 5\)

b)  \(\frac{3}{4} + \frac{4}{{10}}x = \frac{{29}}{{60}}\)

       \(\frac{4}{{10}}x = \frac{{29}}{{60}} - \frac{3}{4}\)

       \(\frac{4}{{10}}x = \frac{{ - 4}}{{15}}\)

           \(x = \frac{{ - 4}}{{15}}:\frac{4}{{10}}\)

           \(x = \frac{{ - 2}}{3}\)