the common denominator is 6x
we multiply the first term by 2x/2x and the second term by 3/3
(x+1)/3 * 2x/2x - (x+2)/2x* (3/3)
2x(x+1) /6x- (x+2)*3/6x
distribute
(2x^2+2x -3x-6 )/6x
(2x^2-x-6)/6x
The numerator is (2x^2-x-6)
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