Question

3) 7(x-1)=4x
6) -5(3-x)=6(x+1)​

Answer 1

Пошаговое объяснение:

1)

$7(x - 1) = 4x \\ 7x - 7 = 4x \\ 7x = 4x + 7 \\ 7x - 4x = 7 \\ 3x = 7 \\ x = 7 \div 3 \\ x = \frac{7}{3}$

Проверка:

____________________________

$7( \frac{7}{3} - 1) = 4 \times \frac{7}{3}$

2)

$- 5(3 - x) = 6(x + 1) \\ - 15 + 5x = 6( x + 1) \\ - 15 + 5x = 6x + 6 \\ - 15 + 5x - 6x = 6 \\ 5x - 6x = 6 + 15 \\ - x = 6 + 15 \\ - x = 21 \\ x = - 21$

Проверка:

______________________________

$- 5(3 + 21) = 6( - 21 + 1)$