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Ответ:

4)

[tex](x + 2.6) \div 0.8 = 7.45[/tex]

[tex](x + \frac{13}{5}) \times \frac{5}{ \\ 4} = \frac{149}{ \\ 20} [/tex]

[tex] \frac{5}{4} x \frac{13}{4} = \frac{149}{20} [/tex]

[tex]25x + 65 = 149[/tex]

[tex]25x = 149 - 65[/tex]

[tex]25x = 84[/tex]

[tex]x = 3 \times \frac{9}{25} [/tex]