x - partia cymbałów
y - partia trąbek
x-4=y+4
3(y-4)=x+4
x=y+8
3y-12=x+4
3y-12=y+8+4
2y=24
y=12
x=12+8=20
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x - partia cymbałów
y - partia trąbek
x-4=y+4
3(y-4)=x+4
x=y+8
3y-12=x+4
3y-12=y+8+4
2y=24
y=12
x=12+8=20