[tex]Zadanie\\\\b)\\\\-5(\frac{1}{4} x+\frac{1}{2}y)+3(\frac{3}{4}x-\frac{1}{2}y)=-\frac{5}{4} x-\frac{5}{2}y+\frac{9}{4} x-\frac{3}{2}y=\frac{4}{4}x-\frac{8}{2}y=x-4y[/tex]
