1)y={5,10,15,20}
2)2x+1<5
2x<5-1
2x<4
x<4:2
x<2
Hp={0,1}
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1)y={5,10,15,20}
2)2x+1<5
2x<5-1
2x<4
x<4:2
x<2
Hp={0,1}