Question

помогите пожалуйста ​

Answer 1

$\frac{x}{4} = \frac{7}{4} - 1 \\ \frac{x}{4} = \frac{7}{4} - \frac{4}{4} \\ \frac{x}{4} = \frac{3}{4} \\ x = 3$

Answer 2

$\frac{3d - 31}{5} = \frac{ - 2}{1} \\ 3d - 31 = - 2 \times 5 \\ 3d - 31 = - 10 \\ 3d = - 10 + 31 \\ 3d = 21 \\ d = \frac{21}{3} \\ d = 7$
ОТВЕТ:7




$\frac{x}{4} + 1 = \frac{7}{4} \\ \frac{x \times 1 + 1 \times 4}{4} = \frac{7}{4} \\ \frac{x + 4}{4} = \frac{7}{4} \\ 4(x + 4) = 28 \\ x + 4 = 7 \\ x = 7 - 4 \\ x = 3$
ОТВЕТ: 3