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2x+y=12 /*-3. x-truskawki
x+3y=20
-6x-3y=-36
x+3y=20
-5x=-16
x=3,20
Odp;d zad19 (2*8+4*11)/6=( 16+44)/6=10 Odp;d zad20 45-75% x-100% x=100*45/75=60 Odp;b