1)6-x(x+1)=9-x2
6-x2-x=9-x2
6-x=9
-x=9-6
-x=3
x=-3
2)6(x-2) = 7x-(3x+1)
6x-12=4x-1
6x-4x=-1+12
2x=11
x=11/2
3)3(2x-4)=2x-(5x+9)
6x-12=2x-5x-9
6x-12=-3-9
6x+3x=-9+12
9x=3
x=1/3
1)6-x(x+1)=9-x2
6-x2-x=9-x2
6-x=9
-x=9-6
-x=3
x=-3
2)6(x-2) = 7x-(3x+1)
6x-12=4x-1
6x-4x=-1+12
2x=11
x=11/2
3)3(2x-4)=2x-(5x+9)
6x-12=2x-5x-9
6x-12=-3-9
6x+3x=-9+12
9x=3
x=1/3