Вопрос:

1. 7x - 12 = 3x + 8

Фотография

Ответ ассистента

1. $7x - 12 = 3x + 8$ $7x - 3x = 8 + 12$ $4x = 20$ $x = 5$ 2. $4(x - 5) = 2x + 6$ $4x - 20 = 2x + 6$ $4x - 2x = 6 + 20$ $2x = 26$ $x = 13$ 3. $15 - 2(3x - 1) = 4x + 7$ $15 - 6x + 2 = 4x + 7$ $17 - 6x = 4x + 7$ $17 - 7 = 4x + 6x$ $10 = 10x$ $x = 1$ 4. $3(2x + 5) - 4 = 5(x + 2)$ $6x + 15 - 4 = 5x + 10$ $6x + 11 = 5x + 10$ $6x - 5x = 10 - 11$ $x = -1$ 5. $8x - (2x - 9) = 4x + 17$ $8x - 2x + 9 = 4x + 17$ $6x + 9 = 4x + 17$ $6x - 4x = 17 - 9$ $2x = 8$ $x = 4$ 6. $2(3x - 4) - 3(x + 1) = 5 - x$ $6x - 8 - 3x - 3 = 5 - x$ $3x - 11 = 5 - x$ $3x + x = 5 + 11$ $4x = 16$ $x = 4$

Другие решения

Что ещё задавали пользователи