solve: 9+7x=7x2, , , , , 3x=9x2 −10, , , , , , , , , , factor: x2+6x+8, (x+2)(x+2), (x+3)(x+3), (x+2)(x+4), (x-4)(x+2), x2-13x+12, (x-1)(x-12), (x-13)(x-1), (x+13)(x-13), (x-2)(x-3), x2+10+16, (x+1)(x+6), (x+2)(x+8), (x-4)(x+5), (x+4)(x+6), x2-4x+3=0, x=1, x=5, x=3, x=2, x=1, x=3, x=3, x=-1, x2+8x+12=0, x=-2, x=4, x=-6, x=-2, x=0, x=-1, x=-1,-2, 2x2+5x-7=0, x=-7/2, x=1, x=-1/2, x=4, x=3, x=4, x=8,x=-5/7, 3x2+2x-1=0, x=-1, x=1/3, x=0,x=-2, x=7,x=-2, x=-3, -2/3.

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