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2*x - pokoje 3 osobowe
18-x-2*x =18-3x - pokoje 4 osobowe
2*x+3*(2*x)+4*(18-3x)=60
2x+6x+72-12x=60
72-60=12x-2x-6x
12=4x
x=3 > pokoji dwuosobowych
2*3=6 > pokoji 3 osobowych
18-3*3 =9 > pokoji 4 osobowych