2<x<5,4 |*7 , 14<7x<37,8
4<y<6 |*2 , 8<2y<12
14+8<7x+2y<37,8+12
22<7x+2y<49,8+
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2<x<5,4 |*7 , 14<7x<37,8
4<y<6 |*2 , 8<2y<12
14+8<7x+2y<37,8+12
22<7x+2y<49,8+