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x + 21=35,3; 3x + 1 < 32,02 în N

Răspuns :

x+21=35,3
x=35,3-21
x=14,3
x∈{14,3}

3x+1<32,02
3x<32,02-1
3x<31,02
x<31,02:3
x<10,34
x∈{0,1,2,3,4,5,6,7,8,9,10}
x+21=35,3
x=35,3-21
x=14,3

3x+1 mai mic 32,02
3x mm 32,02-1
3x mm 31,02
x mm 10,34
x apartine (0,1,2,3,4,5,6,7,8,9,10)