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20x-x-10<50
19x < 50+10
19x<60 /:19
x<3 3/19
( to x/5 jest w ułamku )
4x - x/5 - 2 < 10 /*5
20x-x-10<50
19x<60 /:19
x<60/19
x< 3 i 3/19
4x - x/5 - 2 < 10 /*5
20x-x-10<50
19x<50+10
19x<60 /:19
x<60/19
x< 3 i 3/19