15x^2y^2−3x^3y+75x^4
factor 3x^2 out of everything:
15x^2y^2 would become 3x^2(5y^2)
-3x^3y becomes 3x^2(-1y)
75x^4 becomes 3x^2(25x^2)
factor out 3x^2 from the 3 numbers above to get
3x^2(5y^2-y+25x^2)
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