x2
x
=0
6x2+7x
6x2+7x-20=0
6x2+7x-13=0
6x2+7x-10=0
6x2+7x-5=0
6x2+7x-3=0
6x2+7x+1=0
6x2+7x+2=0
-20
-13
-10
-5
-3
2