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2x 5 -7 = 3
2x+3=9x 3=9x-2x 3=7x x=3/7
2x = 17 then x = 8.5 2x+1=7 then x = 3 2x - 1 = 7 then x = 4 which is your problem
4x2 - 12x + 9 = 4x2 - 6x - 6x + 9 = 2x(2x - 3) - 3(2x - 3) = (2x - 3)(2x - 3) or (2x - 3)2
2x(y - 3) + 7(y - 3) = (2x + 7)(y - 3)