Question

13/20+(3/5+x)=5/6

Answer 1

`13/20+(3/5+x)=5/6`

`3/5+x=5/6-13/20`

`3/5+x=11/60`

`x=11/60-3/5`

`x=-5/12`

Answer 2

\(\dfrac{13}{20}+\left(\dfrac{3}{5}+x\right)=\dfrac{5}{6}\\ \dfrac{3}{5}+x=\dfrac{5}{6}-\dfrac{13}{20}\\ \dfrac{3}{5}+x=\dfrac{11}{60}\\ x=\dfrac{11}{60}-\dfrac{3}{5}\\ x=-\dfrac{5}{12}\)

Answer 3

`13/20 + (3/5 + x) = 5/6`

`=>        3/5 + x     = 13/20 - 5/6`

`=>        3/5 + x     = 11/60`

`=>                 x     = 11/60 - 3/5`

`=>                   x   = -5/12`

Vậy `x = -5/12`