Question

А)9x-6=12x+3
Б)4(x-2)=5(x+7)

Answer 1

А)

9х - 6 = 12х + 3

9х - 12х = 3 + 6

- 3х = 9

х = 9 ÷ (-3)

х = - 3

Проверим:

9 × (-3) - 6 = 12 × (-3) + 3

- 27 - 6 = - 36 + 3

- 33 = - 33

Ответ: х = - 3

Б)

4(х-2) = 5(х+7)

4х - 8 = 5х + 35

4х - 5х = 35 + 8

- х = 43

х = - 43

Проверим:

4 × (-43-2) = 5 × (-43+7)

4 × (-45) = 5 × (-36)

- 180 = - 180

Ответ: х = - 4