Question

din proporția x plus 5 supra 3 egal cu 9 supra 5 x este egal cu

Answer 1

(x+5)/3 = 9/5
5(x+5)=27
5x+25=27
5x=2
x=2/5

Answer 2

$\it \dfrac{x+5}{3}=\dfrac{9}{5} \Longrightarrow x+5=\dfrac{3\cdot9}{5} \Longrightarrow x+5=\dfrac{27}{5} \Longrightarrow x= \dfrac{27}{5}-5 \Longrightarrow \\ \\ \\ \Longrightarrow x=\dfrac{27-25}{5} \Longrightarrow x=\dfrac{2}{5} = 0,4$