Arthur D. answered 03/14/15
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5t^6-7t^3x-6x^2
5*6=5*2*3=10*3 and 10-3=7
(5t^3 )(t^3 )
(5t^3 3x)(t^3 2x)
(5t^3+3x)(t^3-2x) is the answer