x4 barat/4=9x barat/x
(10x +4)/4 = (9×10+x)/x
x(10x+4) = 4(90 + x)
10x² + 4x = 360 + 4x
10x² + 4x - 4x =360
10x² = 360 / : 10
x² = 36
x = √36
x = 6
64/4 = 96/6
16 = 16
[tex] \it \dfrac{\overline{x4}}{4} =\dfrac{\overline{9x}}{x} \Leftrightarrow \dfrac{10x+4}{4} =\dfrac{90+x}{x} \Leftrightarrow 10x^2+4x=360+4x \Leftrightarrow
\\ \\ \\
\Leftrightarrow 10x^2=360 \Leftrightarrow x^2=36 \Leftrightarrow x=6 [/tex]
