[tex]\dfrac{2\cdot x}{5+x}=\dfrac{3}{4}\\\\Zalo\.zenia\\\\5+x\neq 0\\\\x\neq -5\\\\D=R\setminus\left\{-5\right\}\\\\\\\dfrac{2x}{5+x}=\dfrac{3}{4}\ \ \ \ mno\.zymy\ \ na\ \ krzy\.z\\\\2x\cdot4=3(5+x)\\\\8x=15+3x\\\\8x-3x=15\\\\5x=15\ \ |:5\\\\x=3[/tex]
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[tex]\dfrac{2\cdot x}{5+x}=\dfrac{3}{4}\\\\Zalo\.zenia\\\\5+x\neq 0\\\\x\neq -5\\\\D=R\setminus\left\{-5\right\}\\\\\\\dfrac{2x}{5+x}=\dfrac{3}{4}\ \ \ \ mno\.zymy\ \ na\ \ krzy\.z\\\\2x\cdot4=3(5+x)\\\\8x=15+3x\\\\8x-3x=15\\\\5x=15\ \ |:5\\\\x=3[/tex]