Question

РЕШИТЕ ПЖЖ...ЗАРАНЕЕ СПС

Answer 1

$7+\frac{x}{2}=\frac{x+9}{5}\\\\7+\frac{x}{2}=\frac{x}{5}+\frac{9}{5}\\\\\frac{x}{2}-\frac{x}{5}=\frac{9}{5}-7\\\\\frac{3x}{10}=-\frac{26}{5}\\\\x=-\frac{26\cdot 10}{5\cdot 3}\\\\x=-\frac{26\cdot 2}{3}\\\\x=-17\frac{1}{3}$