x2
x
=0
-12x2-19x
-12x2-19x-7=0
-12x2-19x-5=0
-12x2-19x-4=0
-12x2-19x+10=0
-12x2-19x+18=0
-12x2-19x+21=0
-7
-5
-4
10
18
21