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Assuming you are using the standard rules of operator precedence (see related links), I interpret your question as this:-
x + (2/x) + x - (2/x)
(because division is evaluated before addition or subtraction by convention).
In this case, the simplified answer is 2x.
x(x + 2)
i got 42 divided 7x
i thinking this answer should be -20
x2 + 4x = x(x+4)
Assuming simplify = factor...x3 - 3x + 2 = (x-1)(x2+x-2)