Answer :
18x^3 +9x / 6x^2 = 3x
18x^3
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0 9x
so than (18x^3 +9x) divided by 6x^2 will be equal 3x and the remainder is 9x
18x^3
--------
0 9x
so than (18x^3 +9x) divided by 6x^2 will be equal 3x and the remainder is 9x