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1. : 3x2 + 5x + 17x x2.
sage: simplify(3*x^2+5*x +17*x-x^2)
2*x^2 + 22*x
2.4. : 3 x (x 6) (2 x 2 14).
sage: a=3*x*(x-6)-(2*x^2-14); a
3*x*(x-6)-(2*x^2-14)
sage: expand(a)
x^2-18*x+14
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