Ответ:

x=-9

Пошаговое объяснение:

4(7+x)=2(5+x)

28+4x=10+2x

4x-2x=10-28

2x=-18

x=-9

[tex](7 + x) \div 2 = (5 + x) \div 4 \\ (7 + x) \times 4 = (5 + x) \times 2 \\ 7 \times 4 + x \times 4 = 5 \times 2 + x \times 2 \\ 28 + 4x = 10 + 2x \\ 4x - 2x = 10 - 28 \\ 2x = - 18 \\ x = \frac{ - 18}{2} = \frac{ - 9}{1} = - 9 \\ x = - 9[/tex]