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\frac{7}{x-5}=4
4(x-5)=7
4x-20=7
4x=27
x=\frac{27}{4}=6,75
sprawdzenie:
\frac{7}{6,75-5}=\frac{7}{1,75}=4
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\frac{x}{x-5}-\frac{3}{x}=1
\frac{x}{x-5}-\frac{3}{x}=1
\frac{x^2-3(x-5)}{x(x-5)}=1
x^2-3x+15=x^2-5x
x^2-x^2-3x+5x=-15
2x=-15
x=-\frac{15}{2}=-7,5