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12x^2-9x-16x+12=12x^2-8x-30x+20
12x^2-12x^2-9x-16x+8x+30x=20-12
13x=8
x=8/13
-13x+12
(6x-4)(2x-5)= 12x-30x-8x+20
-26+20
(-13x+12)(-26+20)
39x-260x-312+240
39x-260x=-221
-312+240=-72