[tex] \frac{2}{3} [/tex]
___ + [tex] \frac{1}{20}[/tex]=[tex] \frac{4}{5}[/tex]
[tex] \frac{4}{9} x- \frac{4}{9}[/tex]
___ + [tex] \frac{1}{20}[/tex]=[tex] \frac{4}{5}[/tex]
[tex] \frac{4}{9} x- \frac{4}{9}[/tex]
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После избавления от дроби получаем уравнение
2x-2=4
2x=6
x=3
Ответ: x=3