[tex] \frac{9x + 7}{10} - \frac{6}{5} (x - 3) = 4 \: \: | \times 10\\ 9x + 7 - 12(x - 3) = 40 \\ 9x + 7 - 12x + 36 = 40 \\ - 3x = 40 - 43 \\ - 3x = - 3 \\ x = - 3 \div ( - 3) \\ x = 1[/tex]

Ответ:

х = 1

Пошаговое объяснение:

(9х + 7)/10 - 6/5(х - 3) = 4 | * 10

(9х + 7) - 60/5(х - 3) = 40

9х + 7 - 12х + 36 = 40

-3х + 43 = 40

-3х = 40 - 43

-3х = -3

х = -3 : (-3)

х = 1

При х = 1