Question 288551
4x-9>=-1/7+8
4x>=-1/7+8+9
4x>=-1/7+17
4x>=-(1+17*7)/7
4x>=-(1+119)/17
4x>=-120/17
x>=-(120/17)/4
x>=-120/17*1/4
x>=-120/17*4
x>=-120/68
x>=-30/17 ans.