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2,3x-20,7<2 1/3
2,3x<2 1/3+20,7
2,3x<2 1/3+20i 7/10
2,3x<2 10/30+20i 21/30
2,3x<22 31/30
2,3x<23 i 1/30 /:2,3
x< 691/30 :23/10
x< 691/30 * 10/23
x<691/69
x<10 i 1/69
liczba 10