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