Let 6x - 2x - 9 = a, where a is an arbitrary constant. Then
4x - 9 = a
4x = a+9
x = (a+9)/4
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Working from left to right:2x+x=3x3x-6x= -3x
2x + 9 = 6x + 1 9 - 1 = 6x - 2x 8 = 4x x = 2
4x2 + 6x - 3 (with no remainder)
9 - 3(2x - 4) 9 - 6x - 12 6x - 3
5x + x - 6x + 2x = 2x