ПОМОГИТЕ РЕШИТЬ УРАВНЕНИЯ
1. [tex]\frac{2x}{7} = \frac{3+x}{8}[/tex]
2. [tex]\frac{7-x}{5} = \frac{2+x}{15}[/tex]
3. [tex]\frac{x}{3} + \frac{x+1}{7}=\frac{x-2}{6}[/tex]
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