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2x+y/2+x+y/5=1/*10
6x+18/2+6y+24/3=30 (6x skróć z dwójką.!)
20(x+y)/2=10x+10y/5
10x+10y=10/*3
3x+18+2+24=30/*10
30x+30y=30
30x+54+26=30
84y+26=60/:10
x=6
10*6+10y=10
60+10y=70/:10
y=7 x=6
y=7