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