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3 komputery x=100y
20 kalkulatorow y
suma : 12 800
3x+20y=12 800
3(100y)+20y=12 800
300y+20y=12 800
320y=12 800/ 320
y=40 odp. cena kalkulatora
x=100y
x=100*40
x=400 odp.cena komputera
x x 100-cena komputera
x -cena kalkulatora
3x x 100+20 x=12 800
300x+20x=12 800
320x=12 800/:320
x=40-cena kalkulatora
40 x 100=4000-cena komputera
x/100 -cena kalkukatora
3x+20x/100=12800 (skracamy)
3x+x/5=12800 /*5
15x+x=64000
16x=64000/:16
x=4000(cena komputera)
4000:100=40(cena kalkulatora)
spr.3*4000+20*40=12000+800=12800