Question

0,6х+7<х+9 помогите
0,6х-9<х-7

Answer 1

$0.6x + 7 < x + 9 \ 0.6x - x < 9 - 7 \ - 0.4x < 2 \ x > 2 div ( - 0.4) \ x > - 5 \ \ 0.6x - 9 < x - 7 \ 0.6x - x < - 7 + 9 \ - 0.4x < 2 \ x > - 5$