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y - cena kalkulatora
4x+30y=10500
x=30y
4*30y+30y=10500
x=30y
120y+30y=10500
x=30y
150y=10500 |:150
x=30y
y=70
x=30*70
y=70
x=2100
x-komputer
y-kalkulator
4x+30y=10 500
x=30y
4*30y+30y=10 500
120y+30y=10 500
150y= 10 500
y=70
x=30*70=2100