Question

18+3x/x+60=2/5

 

Answer 1

`(18+3x)/(x+60)=2/5 (x ne -60)`

`=> 5 (18+3x) =2 (x+60)`

`=> 15x + 90 = 2x + 120`

`=> 13x = 30` 

`=> x = 30/13` (Thỏa mãn)

Vậy `x = 30/13`

Answer 2

\(\dfrac{18+3x}{x+60}=\dfrac{2}{5}\)
\(\left(18+3x\right)5=2\left(x+60\right)\)
\(5.18+5.3x=2x+60\)
\(90+15x=2x+60\)
\(15x-2x=120-90\)
\(x\left(15-2\right)=30\)
\(x13=30\)
\(x=\dfrac{30}{13}\)