9x2 + 18x - 16 = 0
⇒ (3x - 2)(3x + 8) = 0
⇒ 3x - 2 = 0 → x = 2/3
or 3x + 8 = 0 → x = -22/3
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a minus and a plus equal a minus number yeh dude
Why don't you figure it out yourself
By factoring I get x-3 divided by x+3
7x2 -4x -5x2 +2x = 2x2 -2x