Question

решить уравнение пожалуйста​

Answer 1

Ответ:

1)

$- (14 - 21x) = 56 \\ - 14 + 21x = 56 \\ 21x = 70 \\ x = \frac{70}{21} = 3 \frac{1}{3}$

2)

$7(x + 7) = 10x \\ 7x + 49 = 10x \\ 49 = 3x \\ x = \frac{49}{3} = 16 \frac{1}{3}$

3)

$3(x + 8) = - 3x \\ 3x + 24 = - 3x \\ 6x = - 24 \\ x = - \frac{24}{6} = - 4$

4)

$(45 - y) + 8 = 28 \\ 45 - y + 8 = 28 \\ y = 28 - 8 - 45 \\ y = 25$

5)

5(х-5)= -8х+1

5х-25= -8х+1

13х=26

х=26/13=2